Example source code bank

Showing posts with label NSCalendar example. Show all posts

Thursday, June 13, 2013

NSCalendar NSWrapCalendarComponents example in Objective C (iOS).

NSCalendar NSWrapCalendarComponents

NSDateComponents wrapping behavior
The wrapping option specifies wrapping behavior for calculations involving NSDateComponents objects.

enum
{
NSWrapCalendarComponents = kCFCalendarComponentsWrap,
};
Constants
NSWrapCalendarComponents
Specifies that the components specified for an NSDateComponents object should be incremented and wrap around to zero/one on overflow, but should not cause higher units to be incremented.

NSCalendar NSWrapCalendarComponents example.

You need to use NSCalendar class for calendar calculations:

NSCalendar *gregorian = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
NSDateComponents *comp = [[[NSDateComponents alloc] init] autorelease];
[comp setMonth: 1];
NSDate* newDate = [gregorian dateByAddingComponents:comp toDate:oldDate options:NSWrapCalendarComponents];

Example of [NSCalendar NSWrapCalendarComponents].

// Subtract one day from the current date (this compensates for daylight savings time, etc, etc.)
- (NSDate *)dateBySubtractingOneDayFromDate:(NSDate *)date {
    NSCalendar *cal = [NSCalendar currentCalendar];

    NSDateComponents *minusOneDay = [[NSDateComponents alloc] init];
    [minusOneDay setDay:-1];
    NSDate *newDate = [cal dateByAddingComponents:minusOneDay
                                           toDate:date
                                          options:NSWrapCalendarComponents];
    return newDate;
}

NSCalendar NSWrapCalendarComponents example.

NSDateComponents *daysToAdd = [[[NSDateComponents alloc] init] autorelease];
daysToAdd.day = 23;

NSDate *derivedData =
      [CURRENTC dateByAddingComponents:daysToAdd
                toDate:sourceDate
                options:NSWrapCalendarComponents];

NSCalendar NSTimeZoneCalendarUnit example in Objective C (iOS).

NSCalendar NSTimeZoneCalendarUnit

Calendar Units
Specify calendrical units such as day and month.

enum {
NSEraCalendarUnit = kCFCalendarUnitEra,
NSYearCalendarUnit = kCFCalendarUnitYear,
NSMonthCalendarUnit = kCFCalendarUnitMonth,
NSDayCalendarUnit = kCFCalendarUnitDay,
NSHourCalendarUnit = kCFCalendarUnitHour,
NSMinuteCalendarUnit = kCFCalendarUnitMinute,
NSSecondCalendarUnit = kCFCalendarUnitSecond,
NSWeekCalendarUnit = kCFCalendarUnitWeek,
NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,
NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal,
NSQuarterCalendarUnit = kCFCalendarUnitQuarter,
NSWeekOfMonthCalendarUnit = kCFCalendarUnitWeekOfMonth,
NSWeekOfYearCalendarUnit = kCFCalendarUnitWeekOfYear,
NSYearForWeekOfYearCalendarUnit = kCFCalendarUnitYearForWeekOfYear
NSCalendarCalendarUnit = (1 << 20),
NSTimeZoneCalendarUnit = (1 << 21),
};
typedef NSUInteger NSCalendarUnit;

Constants
NSEraCalendarUnit
Specifies the era unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitEra.
NSYearCalendarUnit
Specifies the year unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitYear.
NSMonthCalendarUnit
Specifies the month unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMonth.
NSDayCalendarUnit
Specifies the day unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitDay.
NSHourCalendarUnit
Specifies the hour unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitHour.
NSMinuteCalendarUnit
Specifies the minute unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMinute.
NSSecondCalendarUnit
Specifies the second unit.
The corresponding value is a double. Equal to kCFCalendarUnitSecond.
NSWeekCalendarUnit
Specifies the week unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeek.
NSWeekdayCalendarUnit
Specifies the weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekday. The weekday units are the numbers 1 through N (where for the Gregorian calendar N=7 and 1 is Sunday).
NSWeekdayOrdinalCalendarUnit
Specifies the ordinal weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekdayOrdinal. The weekday ordinal unit describes ordinal position within the month unit of the corresponding weekday unit. For example, in the Gregorian calendar a weekday ordinal unit of 2 for a weekday unit 3 indicates "the second Tuesday in the month".
NSQuarterCalendarUnit
Specifies the quarter of the calendar as an kCFCalendarUnitSecond.
NSWeekOfMonthCalendarUnit
Specifies the original week of a month calendar unit.
NSWeekOfYearCalendarUnit
Specifies the original week of the year calendar unit.
NSYearForWeekOfYearCalendarUnit
Specifies the year when the calendar is being interpreted as a week-based calendar.
NSCalendarCalendarUnit
Specifies the calendar of the calendar.
NSTimeZoneCalendarUnit
Specifies the time zone of the calendar as an NSTimeZone.

Discussion of [NSCalendar NSTimeZoneCalendarUnit]
Calendar units may be used as a bit mask to specify a combination of units. Values in this enum are equal to the corresponding constants in the CFCalendarUnit enum.

NSCalendar NSTimeZoneCalendarUnit example.

// Now, an absolute date and time that represent now all around the world, that is made to play with
NSDate *now = [NSDate date];

// A specific calendar for a specific place in the world
NSCalendar* parisCalendar = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
[parisCalendar setTimeZone:[NSTimeZone timeZoneWithName:@"Europe/Paris"]];

// Now components seen from Paris
NSDateComponents* componentsNowInParis = [parisCalendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit|NSTimeZoneCalendarUnit fromDate:now];

// Tricking a copy of "Now components seen from Paris" to force 15:00:00, in Paris
NSDateComponents* componentsInParisAt15 = [[componentsNowInParis copy] autorelease];
[componentsInParisAt15 setHour:15];
[componentsInParisAt15 setMinute:0];
[componentsInParisAt15 setSecond:0];

// Getting an universal date reference that represent what could be 15:00:00 seen from paris, Or 19:00:00 from GMT+4
NSDate* dateAt15 = [parisCalendar dateFromComponents:componentsInParisAt15];

// We now have two universal dates that can be compared each other
// If "now" is 16:00:00, those date will show a 60 minutes difference all around the world
NSLog(@"%@", now);
NSLog(@"%@", dateAt15);

Example of [NSCalendar NSTimeZoneCalendarUnit].

NSDate *newDate;
NSDateComponents *dateComponents = [[NSCalendar currentCalendar] components:~NSTimeZoneCalendarUnit fromDate:[NSDate date]];

newDate = [[NSCalendar currentCalendar] dateFromComponents:dateComponents];
NSLog(@"newDate: %@", newDate);
NSLog(@"newDate: %.0f", [newDate timeIntervalSinceReferenceDate]);

NSCalendar NSTimeZoneCalendarUnit example.

- (NSArray *)createPaymentScheduleWithStartDate:(NSDate *)startDate numberOfPayments:(NSUInteger)payments {
    NSUInteger count = 0;
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSMutableArray *schedule = [NSMutableArray arrayWithCapacity:payments];

    // break down the start date for our future payments
    unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit
            | NSTimeZoneCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit;
    NSDateComponents *comps = [cal components:unitFlags fromDate:startDate];
    NSInteger month = [comps month];
    NSInteger day = [comps day];
    NSInteger year = [comps year];

    // For simplicity sake, adjust day larger than 28
    // this way we don't have to test each time we create a date
    // if it valid.
    if (day > 28)
        day = 28;

    // NSDate *a = startDate;
    // because we want all payments to have the same time
    // create the first again
    NSDate *a = [cal dateFromComponents:comps];

    do {
        month++;
        if (month > 12) {
            year++;
            month = 1;
        }

        // create the next month payment date
        comps.month = month;
        comps.day = day;
        comps.year = year;
        NSDate *b = [cal dateFromComponents:comps];

        // find the middle date
        NSTimeInterval m = [b timeIntervalSinceDate:a];
        NSDate *c = [a dateByAddingTimeInterval:m / 2];

        // add dates to our schedule array
        [schedule addObject:a];
        [schedule addObject:c];
        count += 2;

        // adjust to next group of payments
        a = b;

    } while (count < (payments + 5));

    // because we add two payments at a time,
    // we have to adjust that extra payment
    if ([schedule count] > payments) {
        // create range of our excess payments
        NSRange range = NSMakeRange(payments, [schedule count] - payments);
        [schedule removeObjectsInRange:range];
    }

    NSLog(@"Schedule: %@", schedule);
    return [NSArray arrayWithArray:schedule];
}

NSCalendar NSYearForWeekOfYearCalendarUnit example in Objective C (iOS).

NSCalendar NSYearForWeekOfYearCalendarUnit

Calendar Units
Specify calendrical units such as day and month.

enum {
NSEraCalendarUnit = kCFCalendarUnitEra,
NSYearCalendarUnit = kCFCalendarUnitYear,
NSMonthCalendarUnit = kCFCalendarUnitMonth,
NSDayCalendarUnit = kCFCalendarUnitDay,
NSHourCalendarUnit = kCFCalendarUnitHour,
NSMinuteCalendarUnit = kCFCalendarUnitMinute,
NSSecondCalendarUnit = kCFCalendarUnitSecond,
NSWeekCalendarUnit = kCFCalendarUnitWeek,
NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,
NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal,
NSQuarterCalendarUnit = kCFCalendarUnitQuarter,
NSWeekOfMonthCalendarUnit = kCFCalendarUnitWeekOfMonth,
NSWeekOfYearCalendarUnit = kCFCalendarUnitWeekOfYear,
NSYearForWeekOfYearCalendarUnit = kCFCalendarUnitYearForWeekOfYear
NSCalendarCalendarUnit = (1 << 20),
NSTimeZoneCalendarUnit = (1 << 21),
};
typedef NSUInteger NSCalendarUnit;

Constants
NSEraCalendarUnit
Specifies the era unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitEra.
NSYearCalendarUnit
Specifies the year unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitYear.
NSMonthCalendarUnit
Specifies the month unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMonth.
NSDayCalendarUnit
Specifies the day unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitDay.
NSHourCalendarUnit
Specifies the hour unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitHour.
NSMinuteCalendarUnit
Specifies the minute unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMinute.
NSSecondCalendarUnit
Specifies the second unit.
The corresponding value is a double. Equal to kCFCalendarUnitSecond.
NSWeekCalendarUnit
Specifies the week unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeek.
NSWeekdayCalendarUnit
Specifies the weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekday. The weekday units are the numbers 1 through N (where for the Gregorian calendar N=7 and 1 is Sunday).
NSWeekdayOrdinalCalendarUnit
Specifies the ordinal weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekdayOrdinal. The weekday ordinal unit describes ordinal position within the month unit of the corresponding weekday unit. For example, in the Gregorian calendar a weekday ordinal unit of 2 for a weekday unit 3 indicates "the second Tuesday in the month".
NSQuarterCalendarUnit
Specifies the quarter of the calendar as an kCFCalendarUnitSecond.
NSWeekOfMonthCalendarUnit
Specifies the original week of a month calendar unit.
NSWeekOfYearCalendarUnit
Specifies the original week of the year calendar unit.
NSYearForWeekOfYearCalendarUnit
Specifies the year when the calendar is being interpreted as a week-based calendar.
NSCalendarCalendarUnit
Specifies the calendar of the calendar.
NSTimeZoneCalendarUnit
Specifies the time zone of the calendar as an NSTimeZone.

Discussion of [NSCalendar NSYearForWeekOfYearCalendarUnit]
Calendar units may be used as a bit mask to specify a combination of units. Values in this enum are equal to the corresponding constants in the CFCalendarUnit enum.

NSCalendar NSYearForWeekOfYearCalendarUnit example.

NSCalendar *calendar = [NSCalendar currentCalendar];
calendar.firstWeekday = 2;
calendar.minimumDaysInFirstWeek = 4;
int n = [calendar rangeOfUnit:NSWeekOfYearCalendarUnit inUnit:NSYearForWeekOfYearCalendarUnit forDate: [NSDate date]].length;
NSLog(@"%d", n); // 52

Example of [NSCalendar NSYearForWeekOfYearCalendarUnit].

NSCalendar NSYearForWeekOfYearCalendarUnit example.

NSCalendar* calendar = [NSCalendar currentCalendar];
    NSDateComponents* comps = [calendar components:NSYearForWeekOfYearCalendarUnit |NSYearCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSWeekdayCalendarUnit fromDate:[NSDate date]];

    [comps setWeekday:1];
    int monthComponent = comps.month;
   int yearComponent = comps.year;
   NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy MM dd"];

    NSDate *firstDateOfMonth = [dateFormatter dateFromString:[NSString stringWithFormat:@"%d %d 01",yearComponent,monthComponent]];
    firstDateOfMonth = [firstDateOfMonth dateByAddingTimeInterval:19800];
    NSLog(@"firstDateOfMonth-- %@ \r\n",firstDateOfMonth);
    NSLog(@"[NSDate date]-- %@",[[NSDate date] dateByAddingTimeInterval:19800]);

NSCalendar NSWeekOfYearCalendarUnit example in Objective C (iOS).

NSCalendar NSWeekOfYearCalendarUnit

Calendar Units
Specify calendrical units such as day and month.

enum {
NSEraCalendarUnit = kCFCalendarUnitEra,
NSYearCalendarUnit = kCFCalendarUnitYear,
NSMonthCalendarUnit = kCFCalendarUnitMonth,
NSDayCalendarUnit = kCFCalendarUnitDay,
NSHourCalendarUnit = kCFCalendarUnitHour,
NSMinuteCalendarUnit = kCFCalendarUnitMinute,
NSSecondCalendarUnit = kCFCalendarUnitSecond,
NSWeekCalendarUnit = kCFCalendarUnitWeek,
NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,
NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal,
NSQuarterCalendarUnit = kCFCalendarUnitQuarter,
NSWeekOfMonthCalendarUnit = kCFCalendarUnitWeekOfMonth,
NSWeekOfYearCalendarUnit = kCFCalendarUnitWeekOfYear,
NSYearForWeekOfYearCalendarUnit = kCFCalendarUnitYearForWeekOfYear
NSCalendarCalendarUnit = (1 << 20),
NSTimeZoneCalendarUnit = (1 << 21),
};
typedef NSUInteger NSCalendarUnit;

Constants
NSEraCalendarUnit
Specifies the era unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitEra.
NSYearCalendarUnit
Specifies the year unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitYear.
NSMonthCalendarUnit
Specifies the month unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMonth.
NSDayCalendarUnit
Specifies the day unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitDay.
NSHourCalendarUnit
Specifies the hour unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitHour.
NSMinuteCalendarUnit
Specifies the minute unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMinute.
NSSecondCalendarUnit
Specifies the second unit.
The corresponding value is a double. Equal to kCFCalendarUnitSecond.
NSWeekCalendarUnit
Specifies the week unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeek.
NSWeekdayCalendarUnit
Specifies the weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekday. The weekday units are the numbers 1 through N (where for the Gregorian calendar N=7 and 1 is Sunday).
NSWeekdayOrdinalCalendarUnit
Specifies the ordinal weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekdayOrdinal. The weekday ordinal unit describes ordinal position within the month unit of the corresponding weekday unit. For example, in the Gregorian calendar a weekday ordinal unit of 2 for a weekday unit 3 indicates "the second Tuesday in the month".
NSQuarterCalendarUnit
Specifies the quarter of the calendar as an kCFCalendarUnitSecond.
NSWeekOfMonthCalendarUnit
Specifies the original week of a month calendar unit.
NSWeekOfYearCalendarUnit
Specifies the original week of the year calendar unit.
NSYearForWeekOfYearCalendarUnit
Specifies the year when the calendar is being interpreted as a week-based calendar.
NSCalendarCalendarUnit
Specifies the calendar of the calendar.
NSTimeZoneCalendarUnit
Specifies the time zone of the calendar as an NSTimeZone.

Discussion of [NSCalendar NSWeekOfYearCalendarUnit]
Calendar units may be used as a bit mask to specify a combination of units. Values in this enum are equal to the corresponding constants in the CFCalendarUnit enum.

NSCalendar NSWeekOfYearCalendarUnit example.

Example of [NSCalendar NSWeekOfYearCalendarUnit].

NSDate *date = your date;
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDate *startOfWeek;
[calendar rangeOfUnit:NSWeekOfYearCalendarUnit
            startDate:&startOfWeek
             interval:NULL
              forDate:date];

NSCalendar NSWeekOfYearCalendarUnit example.

- (NSArray *)weeksOfMonth:(int)month inYear:(int)year
{
    NSCalendar *calendar = [NSCalendar currentCalendar];

    NSDateComponents *components = [[[NSDateComponents alloc] init] autorelease];
    [components setMonth:month];
    [components setYear:year];

    NSRange range = [calendar rangeOfUnit:NSDayCalendarUnit
                                   inUnit:NSMonthCalendarUnit
                                  forDate:[calendar dateFromComponents:components]];

    calendar = [NSCalendar currentCalendar];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd"];
    NSMutableSet *weeks = [[NSMutableSet alloc] init ];

    for(int i = 0; i < range.length; i++)
    {
        NSString *temp = [NSString stringWithFormat:@"%4d-%2d-%2d",year,month,range.location+i];
        NSDate *date = [dateFormatter dateFromString:temp ];
        int week = [[calendar components: NSWeekOfYearCalendarUnit fromDate:date] weekOfYear];
        [weeks addObject:[NSNumber numberWithInt:week]];
    }

    NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"" ascending:YES];
    NSArray *descriptors = [[NSArray alloc] initWithObjects:descriptor, nil];
    return [weeks sortedArrayUsingDescriptors:descriptors];
}

NSCalendar NSWeekdayOrdinalCalendarUnit example in Objective C (iOS).

NSCalendar NSWeekdayOrdinalCalendarUnit

Calendar Units
Specify calendrical units such as day and month.

enum {
NSEraCalendarUnit = kCFCalendarUnitEra,
NSYearCalendarUnit = kCFCalendarUnitYear,
NSMonthCalendarUnit = kCFCalendarUnitMonth,
NSDayCalendarUnit = kCFCalendarUnitDay,
NSHourCalendarUnit = kCFCalendarUnitHour,
NSMinuteCalendarUnit = kCFCalendarUnitMinute,
NSSecondCalendarUnit = kCFCalendarUnitSecond,
NSWeekCalendarUnit = kCFCalendarUnitWeek,
NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,
NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal,
NSQuarterCalendarUnit = kCFCalendarUnitQuarter,
NSWeekOfMonthCalendarUnit = kCFCalendarUnitWeekOfMonth,
NSWeekOfYearCalendarUnit = kCFCalendarUnitWeekOfYear,
NSYearForWeekOfYearCalendarUnit = kCFCalendarUnitYearForWeekOfYear
NSCalendarCalendarUnit = (1 << 20),
NSTimeZoneCalendarUnit = (1 << 21),
};
typedef NSUInteger NSCalendarUnit;

Constants
NSEraCalendarUnit
Specifies the era unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitEra.
NSYearCalendarUnit
Specifies the year unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitYear.
NSMonthCalendarUnit
Specifies the month unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMonth.
NSDayCalendarUnit
Specifies the day unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitDay.
NSHourCalendarUnit
Specifies the hour unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitHour.
NSMinuteCalendarUnit
Specifies the minute unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMinute.
NSSecondCalendarUnit
Specifies the second unit.
The corresponding value is a double. Equal to kCFCalendarUnitSecond.
NSWeekCalendarUnit
Specifies the week unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeek.
NSWeekdayCalendarUnit
Specifies the weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekday. The weekday units are the numbers 1 through N (where for the Gregorian calendar N=7 and 1 is Sunday).
NSWeekdayOrdinalCalendarUnit
Specifies the ordinal weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekdayOrdinal. The weekday ordinal unit describes ordinal position within the month unit of the corresponding weekday unit. For example, in the Gregorian calendar a weekday ordinal unit of 2 for a weekday unit 3 indicates "the second Tuesday in the month".
NSQuarterCalendarUnit
Specifies the quarter of the calendar as an kCFCalendarUnitSecond.
NSWeekOfMonthCalendarUnit
Specifies the original week of a month calendar unit.
NSWeekOfYearCalendarUnit
Specifies the original week of the year calendar unit.
NSYearForWeekOfYearCalendarUnit
Specifies the year when the calendar is being interpreted as a week-based calendar.
NSCalendarCalendarUnit
Specifies the calendar of the calendar.
NSTimeZoneCalendarUnit
Specifies the time zone of the calendar as an NSTimeZone.

Discussion of [NSCalendar NSWeekdayOrdinalCalendarUnit]
Calendar units may be used as a bit mask to specify a combination of units. Values in this enum are equal to the corresponding constants in the CFCalendarUnit enum.

NSCalendar NSWeekdayOrdinalCalendarUnit example.

- (BOOL) isSameWeekAsDate: (NSDate *) aDate andDate:(NSDate *) bDate
{
    NSDateComponents *components1 = [[NSCalendar currentCalendar] components:(NSYearCalendarUnit| NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekCalendarUnit |  NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSWeekdayCalendarUnit | NSWeekdayOrdinalCalendarUnit) fromDate:aDate];
    NSDateComponents *components2 = [[NSCalendar currentCalendar] components:(NSYearCalendarUnit| NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekCalendarUnit |  NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSWeekdayCalendarUnit | NSWeekdayOrdinalCalendarUnit) fromDate:bDate];

    if ([components1 week] != [components2 week]) return NO;

    //return (abs([self timeIntervalSinceDate:aDate]) < 604800); // ops, forgot to change "self" with parameter "bDate":
    return (abs([bDate timeIntervalSinceDate:aDate]) < 604800);
}

Example of [NSCalendar NSWeekdayOrdinalCalendarUnit].

NSDate *today = [[NSDate alloc] init];
NSLog([today description]);

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

NSDateComponents *weekdayComponents = [gregorian components:(NSWeekdayCalendarUnit | NSWeekdayOrdinalCalendarUnit) fromDate:today];

NSDateComponents *componentsToSubtract = [[NSDateComponents alloc] init];
[componentsToSubtract setDay: 0 - ([weekdayComponents weekday])];
[componentsToSubtract setWeekdayOrdinal:([weekdayComponents weekday] <= 6) ? 3 : 4];
//[componentsToSubtract setWeekdayOrdinal:3]; //old way - not perfect

NSDate *saturday = [gregorian dateByAddingComponents:componentsToSubtract toDate:today options:0];
NSDateComponents *components =
[gregorian components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit)
fromDate: saturday];
saturday = [gregorian dateFromComponents:components];

NSLog([saturday description]);

NSCalendar NSWeekdayOrdinalCalendarUnit example.

-(NSString *)relativeTime:(int)datetimestamp
{
    NSDate *aDate = [NSDate dateWithTimeIntervalSince1970:datetimestamp];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    unsigned int unitFlags =  NSYearCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSWeekdayOrdinalCalendarUnit|NSWeekdayCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit;
    NSDateComponents *messageDateComponents = [calendar components:unitFlags fromDate:aDate];
    NSDateComponents *todayDateComponents = [calendar components:unitFlags fromDate:[NSDate date]];

    NSUInteger dayOfYearForMessage = [calendar ordinalityOfUnit:NSDayCalendarUnit inUnit:NSYearCalendarUnit forDate:aDate];
    NSUInteger dayOfYearForToday = [calendar ordinalityOfUnit:NSDayCalendarUnit inUnit:NSYearCalendarUnit forDate:[NSDate date]];

    NSString *dateString;

    if ([messageDateComponents year] == [todayDateComponents year] &&
        [messageDateComponents month] == [todayDateComponents month] &&
        [messageDateComponents day] == [todayDateComponents day])
    {
        dateString = [NSString stringWithFormat:@"%02d:%02d", [messageDateComponents hour], [messageDateComponents minute]];
    } else if ([messageDateComponents year] == [todayDateComponents year] &&
               dayOfYearForMessage == (dayOfYearForToday-1))
    {
        dateString = @"Yesterday";
    } else if ([messageDateComponents year] == [todayDateComponents year] &&
               dayOfYearForMessage > (dayOfYearForToday-6))
    {

        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"EEEE"];
        dateString = [dateFormatter stringFromDate:aDate];
        [dateFormatter release];

    } else {

        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"yy"];
        dateString = [NSString stringWithFormat:@"%02d/%02d/%@", [messageDateComponents day], [messageDateComponents month], [dateFormatter stringFromDate:aDate]];
        [dateFormatter release];
    }

    return dateString;
}

NSCalendar NSWeekdayCalendarUnit example in Objective C (iOS).

NSCalendar NSWeekdayCalendarUnit

Calendar Units
Specify calendrical units such as day and month.

enum {
NSEraCalendarUnit = kCFCalendarUnitEra,
NSYearCalendarUnit = kCFCalendarUnitYear,
NSMonthCalendarUnit = kCFCalendarUnitMonth,
NSDayCalendarUnit = kCFCalendarUnitDay,
NSHourCalendarUnit = kCFCalendarUnitHour,
NSMinuteCalendarUnit = kCFCalendarUnitMinute,
NSSecondCalendarUnit = kCFCalendarUnitSecond,
NSWeekCalendarUnit = kCFCalendarUnitWeek,
NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,
NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal,
NSQuarterCalendarUnit = kCFCalendarUnitQuarter,
NSWeekOfMonthCalendarUnit = kCFCalendarUnitWeekOfMonth,
NSWeekOfYearCalendarUnit = kCFCalendarUnitWeekOfYear,
NSYearForWeekOfYearCalendarUnit = kCFCalendarUnitYearForWeekOfYear
NSCalendarCalendarUnit = (1 << 20),
NSTimeZoneCalendarUnit = (1 << 21),
};
typedef NSUInteger NSCalendarUnit;

Constants
NSEraCalendarUnit
Specifies the era unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitEra.
NSYearCalendarUnit
Specifies the year unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitYear.
NSMonthCalendarUnit
Specifies the month unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMonth.
NSDayCalendarUnit
Specifies the day unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitDay.
NSHourCalendarUnit
Specifies the hour unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitHour.
NSMinuteCalendarUnit
Specifies the minute unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMinute.
NSSecondCalendarUnit
Specifies the second unit.
The corresponding value is a double. Equal to kCFCalendarUnitSecond.
NSWeekCalendarUnit
Specifies the week unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeek.
NSWeekdayCalendarUnit
Specifies the weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekday. The weekday units are the numbers 1 through N (where for the Gregorian calendar N=7 and 1 is Sunday).
NSWeekdayOrdinalCalendarUnit
Specifies the ordinal weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekdayOrdinal. The weekday ordinal unit describes ordinal position within the month unit of the corresponding weekday unit. For example, in the Gregorian calendar a weekday ordinal unit of 2 for a weekday unit 3 indicates "the second Tuesday in the month".
NSQuarterCalendarUnit
Specifies the quarter of the calendar as an kCFCalendarUnitSecond.
NSWeekOfMonthCalendarUnit
Specifies the original week of a month calendar unit.
NSWeekOfYearCalendarUnit
Specifies the original week of the year calendar unit.
NSYearForWeekOfYearCalendarUnit
Specifies the year when the calendar is being interpreted as a week-based calendar.
NSCalendarCalendarUnit
Specifies the calendar of the calendar.
NSTimeZoneCalendarUnit
Specifies the time zone of the calendar as an NSTimeZone.

Discussion of [NSCalendar NSWeekdayCalendarUnit]
Calendar units may be used as a bit mask to specify a combination of units. Values in this enum are equal to the corresponding constants in the CFCalendarUnit enum.

NSCalendar NSWeekdayCalendarUnit example.

NSCalendar *gregorian = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
[gregorian setFirstWeekday:2]; // Sunday == 1, Saturday == 7
NSUInteger adjustedWeekdayOrdinal = [gregorian ordinalityOfUnit:NSWeekdayCalendarUnit inUnit:NSWeekCalendarUnit forDate:[NSDate date]];
NSLog(@"Adjusted weekday ordinal: %d", adjustedWeekdayOrdinal);

Example of [NSCalendar NSWeekdayCalendarUnit].

NSCalendar *cal=[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *comps = [cal components:NSWeekdayCalendarUnit fromDate:[NSDate date]];
// set to 7 if it's Sunday otherwise decrease weekday number
NSInteger weekday=[comps weekday]==1?7:[comps weekday]-1;

NSCalendar NSWeekdayCalendarUnit example.

// Finds the date for the first day of the week
- (NSDate *)getFirstDayOfTheWeekFromDate:(NSDate *)givenDate
{
    NSCalendar *calendar = [NSCalendar currentCalendar];

    // Edge case where beginning of week starts in the prior month
    NSDateComponents *edgeCase = [[NSDateComponents alloc] init];
    [edgeCase setMonth:2];
    [edgeCase setDay:1];
    [edgeCase setYear:2013];
    NSDate *edgeCaseDate = [calendar dateFromComponents:edgeCase];

    NSDateComponents *components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSWeekdayCalendarUnit fromDate:edgeCaseDate];
    [components setWeekday:1]; // 1 == Sunday, 7 == Saturday
    [components setWeek:[components week]];

    NSLog(@"Edge case date is %@ and beginning of that week is %@", edgeCaseDate , [calendar dateFromComponents:components]);

    // Find Sunday for the given date
    components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSWeekdayCalendarUnit fromDate:givenDate];
    [components setWeekday:1]; // 1 == Sunday, 7 == Saturday
    [components setWeek:[components week]];

    NSLog(@"Original date is %@ and beginning of week is %@", givenDate , [calendar dateFromComponents:components]);

    return [calendar dateFromComponents:components];
}

NSCalendar NSWeekCalendarUnit example in Objective C (iOS).

NSCalendar NSWeekCalendarUnit

Calendar Units
Specify calendrical units such as day and month.

enum {
NSEraCalendarUnit = kCFCalendarUnitEra,
NSYearCalendarUnit = kCFCalendarUnitYear,
NSMonthCalendarUnit = kCFCalendarUnitMonth,
NSDayCalendarUnit = kCFCalendarUnitDay,
NSHourCalendarUnit = kCFCalendarUnitHour,
NSMinuteCalendarUnit = kCFCalendarUnitMinute,
NSSecondCalendarUnit = kCFCalendarUnitSecond,
NSWeekCalendarUnit = kCFCalendarUnitWeek,
NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,
NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal,
NSQuarterCalendarUnit = kCFCalendarUnitQuarter,
NSWeekOfMonthCalendarUnit = kCFCalendarUnitWeekOfMonth,
NSWeekOfYearCalendarUnit = kCFCalendarUnitWeekOfYear,
NSYearForWeekOfYearCalendarUnit = kCFCalendarUnitYearForWeekOfYear
NSCalendarCalendarUnit = (1 << 20),
NSTimeZoneCalendarUnit = (1 << 21),
};
typedef NSUInteger NSCalendarUnit;

Constants
NSEraCalendarUnit
Specifies the era unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitEra.
NSYearCalendarUnit
Specifies the year unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitYear.
NSMonthCalendarUnit
Specifies the month unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMonth.
NSDayCalendarUnit
Specifies the day unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitDay.
NSHourCalendarUnit
Specifies the hour unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitHour.
NSMinuteCalendarUnit
Specifies the minute unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMinute.
NSSecondCalendarUnit
Specifies the second unit.
The corresponding value is a double. Equal to kCFCalendarUnitSecond.
NSWeekCalendarUnit
Specifies the week unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeek.
NSWeekdayCalendarUnit
Specifies the weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekday. The weekday units are the numbers 1 through N (where for the Gregorian calendar N=7 and 1 is Sunday).
NSWeekdayOrdinalCalendarUnit
Specifies the ordinal weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekdayOrdinal. The weekday ordinal unit describes ordinal position within the month unit of the corresponding weekday unit. For example, in the Gregorian calendar a weekday ordinal unit of 2 for a weekday unit 3 indicates "the second Tuesday in the month".
NSQuarterCalendarUnit
Specifies the quarter of the calendar as an kCFCalendarUnitSecond.
NSWeekOfMonthCalendarUnit
Specifies the original week of a month calendar unit.
NSWeekOfYearCalendarUnit
Specifies the original week of the year calendar unit.
NSYearForWeekOfYearCalendarUnit
Specifies the year when the calendar is being interpreted as a week-based calendar.
NSCalendarCalendarUnit
Specifies the calendar of the calendar.
NSTimeZoneCalendarUnit
Specifies the time zone of the calendar as an NSTimeZone.

Discussion of [NSCalendar NSWeekCalendarUnit]
Calendar units may be used as a bit mask to specify a combination of units. Values in this enum are equal to the corresponding constants in the CFCalendarUnit enum.

NSCalendar NSWeekCalendarUnit example.

Example of [NSCalendar NSWeekCalendarUnit].

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

NSDate *today = [NSDate date];
NSDate *beginningOfWeek = nil;
BOOL ok = [gregorian rangeOfUnit:NSWeekCalendarUnit startDate:&beginningOfWeek
interval:NULL forDate: today];

NSCalendar NSWeekCalendarUnit example.

NSCalendar NSSecondCalendarUnit example in Objective C (iOS).

NSCalendar NSSecondCalendarUnit

Calendar Units
Specify calendrical units such as day and month.

enum {
NSEraCalendarUnit = kCFCalendarUnitEra,
NSYearCalendarUnit = kCFCalendarUnitYear,
NSMonthCalendarUnit = kCFCalendarUnitMonth,
NSDayCalendarUnit = kCFCalendarUnitDay,
NSHourCalendarUnit = kCFCalendarUnitHour,
NSMinuteCalendarUnit = kCFCalendarUnitMinute,
NSSecondCalendarUnit = kCFCalendarUnitSecond,
NSWeekCalendarUnit = kCFCalendarUnitWeek,
NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,
NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal,
NSQuarterCalendarUnit = kCFCalendarUnitQuarter,
NSWeekOfMonthCalendarUnit = kCFCalendarUnitWeekOfMonth,
NSWeekOfYearCalendarUnit = kCFCalendarUnitWeekOfYear,
NSYearForWeekOfYearCalendarUnit = kCFCalendarUnitYearForWeekOfYear
NSCalendarCalendarUnit = (1 << 20),
NSTimeZoneCalendarUnit = (1 << 21),
};
typedef NSUInteger NSCalendarUnit;

Constants
NSEraCalendarUnit
Specifies the era unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitEra.
NSYearCalendarUnit
Specifies the year unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitYear.
NSMonthCalendarUnit
Specifies the month unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMonth.
NSDayCalendarUnit
Specifies the day unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitDay.
NSHourCalendarUnit
Specifies the hour unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitHour.
NSMinuteCalendarUnit
Specifies the minute unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMinute.
NSSecondCalendarUnit
Specifies the second unit.
The corresponding value is a double. Equal to kCFCalendarUnitSecond.
NSWeekCalendarUnit
Specifies the week unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeek.
NSWeekdayCalendarUnit
Specifies the weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekday. The weekday units are the numbers 1 through N (where for the Gregorian calendar N=7 and 1 is Sunday).
NSWeekdayOrdinalCalendarUnit
Specifies the ordinal weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekdayOrdinal. The weekday ordinal unit describes ordinal position within the month unit of the corresponding weekday unit. For example, in the Gregorian calendar a weekday ordinal unit of 2 for a weekday unit 3 indicates "the second Tuesday in the month".
NSQuarterCalendarUnit
Specifies the quarter of the calendar as an kCFCalendarUnitSecond.
NSWeekOfMonthCalendarUnit
Specifies the original week of a month calendar unit.
NSWeekOfYearCalendarUnit
Specifies the original week of the year calendar unit.
NSYearForWeekOfYearCalendarUnit
Specifies the year when the calendar is being interpreted as a week-based calendar.
NSCalendarCalendarUnit
Specifies the calendar of the calendar.
NSTimeZoneCalendarUnit
Specifies the time zone of the calendar as an NSTimeZone.

Discussion of [NSCalendar NSSecondCalendarUnit]
Calendar units may be used as a bit mask to specify a combination of units. Values in this enum are equal to the corresponding constants in the CFCalendarUnit enum.

NSCalendar NSSecondCalendarUnit example.

unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;
NSDateComponents *comps = [[NSCalendar currentCalendar] components:unitFlags fromDate:day1];
NSDate *day3 = [[NSCalendar currentCalendar] dateFromComponents:comps];

unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
comps = [[NSCalendar currentCalendar] components:unitFlags fromDate:day2];
day3 = [[NSCalendar currentCalendar] dateByAddingComponents:comps toDate:day3 options:0];

Example of [NSCalendar NSSecondCalendarUnit].

// Seconds per day (24h * 60m * 60s)
#define kSecondsPerDay 86400.0f

+ (BOOL) dateIsToday:(NSDate*)dateToCheck
{
    // Split today into components
    NSCalendar* gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents* comps = [gregorian components:(NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit)
                                        fromDate:[NSDate date]];

    // Set to this morning 00:00:00
    [comps setHour:0];
    [comps setMinute:0];
    [comps setSecond:0];
    NSDate* theMidnightHour = [gregorian dateFromComponents:comps];
    [gregorian release];

    // Get time difference (in seconds) between date and then
    NSTimeInterval diff = [dateToCheck timeIntervalSinceDate:theMidnightHour];
    return ( diff>=0.0f && diff<kSecondsPerDay );
}

NSCalendar NSSecondCalendarUnit example.

@implementation NSDate (Additions)

- (void)assignFlags:(NSUInteger)unitFlags to:(NSDateComponents *)components {
  NSDateComponents *myComponents =
        [[NSCalendar currentCalendar] components: unitFlags
                                        fromDate: self];
  if (unitFlags & NSYearCalendarUnit)
    [components setYear: [myComponents year]];
  if (unitFlags & NSMonthCalendarUnit)
    [components setMonth: [myComponents month]];
  if (unitFlags & NSDayCalendarUnit)
    [components setDay: [myComponents day]];
  if (unitFlags & NSHourCalendarUnit)
    [components setHour: [myComponents hour]];
  if (unitFlags & NSMinuteCalendarUnit)
    [components setMinute: [myComponents minute]];
  if (unitFlags & NSSecondCalendarUnit)
    [components setSecond: [myComponents second]];
}

- (NSDate *)dateByTakingComponents:(NSUInteger)unitFlags fromDate:(NSDate *)date {

  NSUInteger allFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit |
    NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;

  NSDateComponents *allComponents = [[NSDateComponents alloc] init];
  [date assignFlags: unitFlags to: allComponents];
  [self assignFlags: allFlags & ~unitFlags to: allComponents];

  NSDate *result = [[NSCalendar currentCalendar] dateFromComponents: allComponents];
  [allComponents release];

  return result;
}

NSCalendar NSMinuteCalendarUnit example in Objective C (iOS).

NSCalendar NSMinuteCalendarUnit

Calendar Units
Specify calendrical units such as day and month.

enum {
NSEraCalendarUnit = kCFCalendarUnitEra,
NSYearCalendarUnit = kCFCalendarUnitYear,
NSMonthCalendarUnit = kCFCalendarUnitMonth,
NSDayCalendarUnit = kCFCalendarUnitDay,
NSHourCalendarUnit = kCFCalendarUnitHour,
NSMinuteCalendarUnit = kCFCalendarUnitMinute,
NSSecondCalendarUnit = kCFCalendarUnitSecond,
NSWeekCalendarUnit = kCFCalendarUnitWeek,
NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,
NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal,
NSQuarterCalendarUnit = kCFCalendarUnitQuarter,
NSWeekOfMonthCalendarUnit = kCFCalendarUnitWeekOfMonth,
NSWeekOfYearCalendarUnit = kCFCalendarUnitWeekOfYear,
NSYearForWeekOfYearCalendarUnit = kCFCalendarUnitYearForWeekOfYear
NSCalendarCalendarUnit = (1 << 20),
NSTimeZoneCalendarUnit = (1 << 21),
};
typedef NSUInteger NSCalendarUnit;

Constants
NSEraCalendarUnit
Specifies the era unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitEra.
NSYearCalendarUnit
Specifies the year unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitYear.
NSMonthCalendarUnit
Specifies the month unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMonth.
NSDayCalendarUnit
Specifies the day unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitDay.
NSHourCalendarUnit
Specifies the hour unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitHour.
NSMinuteCalendarUnit
Specifies the minute unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMinute.
NSSecondCalendarUnit
Specifies the second unit.
The corresponding value is a double. Equal to kCFCalendarUnitSecond.
NSWeekCalendarUnit
Specifies the week unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeek.
NSWeekdayCalendarUnit
Specifies the weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekday. The weekday units are the numbers 1 through N (where for the Gregorian calendar N=7 and 1 is Sunday).
NSWeekdayOrdinalCalendarUnit
Specifies the ordinal weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekdayOrdinal. The weekday ordinal unit describes ordinal position within the month unit of the corresponding weekday unit. For example, in the Gregorian calendar a weekday ordinal unit of 2 for a weekday unit 3 indicates "the second Tuesday in the month".
NSQuarterCalendarUnit
Specifies the quarter of the calendar as an kCFCalendarUnitSecond.
NSWeekOfMonthCalendarUnit
Specifies the original week of a month calendar unit.
NSWeekOfYearCalendarUnit
Specifies the original week of the year calendar unit.
NSYearForWeekOfYearCalendarUnit
Specifies the year when the calendar is being interpreted as a week-based calendar.
NSCalendarCalendarUnit
Specifies the calendar of the calendar.
NSTimeZoneCalendarUnit
Specifies the time zone of the calendar as an NSTimeZone.

Discussion of [NSCalendar NSMinuteCalendarUnit]
Calendar units may be used as a bit mask to specify a combination of units. Values in this enum are equal to the corresponding constants in the CFCalendarUnit enum.

NSCalendar NSMinuteCalendarUnit example.

Example of [NSCalendar NSMinuteCalendarUnit].

NSCalendar NSMinuteCalendarUnit example.

NSCalendar NSHourCalendarUnit example in Objective C (iOS).

NSCalendar NSHourCalendarUnit

Calendar Units
Specify calendrical units such as day and month.

enum {
NSEraCalendarUnit = kCFCalendarUnitEra,
NSYearCalendarUnit = kCFCalendarUnitYear,
NSMonthCalendarUnit = kCFCalendarUnitMonth,
NSDayCalendarUnit = kCFCalendarUnitDay,
NSHourCalendarUnit = kCFCalendarUnitHour,
NSMinuteCalendarUnit = kCFCalendarUnitMinute,
NSSecondCalendarUnit = kCFCalendarUnitSecond,
NSWeekCalendarUnit = kCFCalendarUnitWeek,
NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,
NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal,
NSQuarterCalendarUnit = kCFCalendarUnitQuarter,
NSWeekOfMonthCalendarUnit = kCFCalendarUnitWeekOfMonth,
NSWeekOfYearCalendarUnit = kCFCalendarUnitWeekOfYear,
NSYearForWeekOfYearCalendarUnit = kCFCalendarUnitYearForWeekOfYear
NSCalendarCalendarUnit = (1 << 20),
NSTimeZoneCalendarUnit = (1 << 21),
};
typedef NSUInteger NSCalendarUnit;

Constants
NSEraCalendarUnit
Specifies the era unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitEra.
NSYearCalendarUnit
Specifies the year unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitYear.
NSMonthCalendarUnit
Specifies the month unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMonth.
NSDayCalendarUnit
Specifies the day unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitDay.
NSHourCalendarUnit
Specifies the hour unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitHour.
NSMinuteCalendarUnit
Specifies the minute unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMinute.
NSSecondCalendarUnit
Specifies the second unit.
The corresponding value is a double. Equal to kCFCalendarUnitSecond.
NSWeekCalendarUnit
Specifies the week unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeek.
NSWeekdayCalendarUnit
Specifies the weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekday. The weekday units are the numbers 1 through N (where for the Gregorian calendar N=7 and 1 is Sunday).
NSWeekdayOrdinalCalendarUnit
Specifies the ordinal weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekdayOrdinal. The weekday ordinal unit describes ordinal position within the month unit of the corresponding weekday unit. For example, in the Gregorian calendar a weekday ordinal unit of 2 for a weekday unit 3 indicates "the second Tuesday in the month".
NSQuarterCalendarUnit
Specifies the quarter of the calendar as an kCFCalendarUnitSecond.
NSWeekOfMonthCalendarUnit
Specifies the original week of a month calendar unit.
NSWeekOfYearCalendarUnit
Specifies the original week of the year calendar unit.
NSYearForWeekOfYearCalendarUnit
Specifies the year when the calendar is being interpreted as a week-based calendar.
NSCalendarCalendarUnit
Specifies the calendar of the calendar.
NSTimeZoneCalendarUnit
Specifies the time zone of the calendar as an NSTimeZone.

Discussion of [NSCalendar NSHourCalendarUnit]
Calendar units may be used as a bit mask to specify a combination of units. Values in this enum are equal to the corresponding constants in the CFCalendarUnit enum.
NSCalendar NSHourCalendarUnit example.

Example of [NSCalendar NSHourCalendarUnit].

NSCalendar NSHourCalendarUnit example.

NSCalendar NSDayCalendarUnit example in Objective C (iOS).

NSCalendar NSDayCalendarUnit

Calendar Units
Specify calendrical units such as day and month.

enum {
NSEraCalendarUnit = kCFCalendarUnitEra,
NSYearCalendarUnit = kCFCalendarUnitYear,
NSMonthCalendarUnit = kCFCalendarUnitMonth,
NSDayCalendarUnit = kCFCalendarUnitDay,
NSHourCalendarUnit = kCFCalendarUnitHour,
NSMinuteCalendarUnit = kCFCalendarUnitMinute,
NSSecondCalendarUnit = kCFCalendarUnitSecond,
NSWeekCalendarUnit = kCFCalendarUnitWeek,
NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,
NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal,
NSQuarterCalendarUnit = kCFCalendarUnitQuarter,
NSWeekOfMonthCalendarUnit = kCFCalendarUnitWeekOfMonth,
NSWeekOfYearCalendarUnit = kCFCalendarUnitWeekOfYear,
NSYearForWeekOfYearCalendarUnit = kCFCalendarUnitYearForWeekOfYear
NSCalendarCalendarUnit = (1 << 20),
NSTimeZoneCalendarUnit = (1 << 21),
};
typedef NSUInteger NSCalendarUnit;

Constants
NSEraCalendarUnit
Specifies the era unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitEra.
NSYearCalendarUnit
Specifies the year unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitYear.
NSMonthCalendarUnit
Specifies the month unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMonth.
NSDayCalendarUnit
Specifies the day unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitDay.
NSHourCalendarUnit
Specifies the hour unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitHour.
NSMinuteCalendarUnit
Specifies the minute unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMinute.
NSSecondCalendarUnit
Specifies the second unit.
The corresponding value is a double. Equal to kCFCalendarUnitSecond.
NSWeekCalendarUnit
Specifies the week unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeek.
NSWeekdayCalendarUnit
Specifies the weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekday. The weekday units are the numbers 1 through N (where for the Gregorian calendar N=7 and 1 is Sunday).
NSWeekdayOrdinalCalendarUnit
Specifies the ordinal weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekdayOrdinal. The weekday ordinal unit describes ordinal position within the month unit of the corresponding weekday unit. For example, in the Gregorian calendar a weekday ordinal unit of 2 for a weekday unit 3 indicates "the second Tuesday in the month".
NSQuarterCalendarUnit
Specifies the quarter of the calendar as an kCFCalendarUnitSecond.
NSWeekOfMonthCalendarUnit
Specifies the original week of a month calendar unit.
NSWeekOfYearCalendarUnit
Specifies the original week of the year calendar unit.
NSYearForWeekOfYearCalendarUnit
Specifies the year when the calendar is being interpreted as a week-based calendar.
NSCalendarCalendarUnit
Specifies the calendar of the calendar.
NSTimeZoneCalendarUnit
Specifies the time zone of the calendar as an NSTimeZone.

Discussion of [NSCalendar NSDayCalendarUnit]
Calendar units may be used as a bit mask to specify a combination of units. Values in this enum are equal to the corresponding constants in the CFCalendarUnit enum.
NSCalendar NSDayCalendarUnit example.

NSDateComponents *otherDay = [[NSCalendar currentCalendar] components:NSEraCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:aDate];
NSDateComponents *today = [[NSCalendar currentCalendar] components:NSEraCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:[NSDate date]];
if([today day] == [otherDay day] &&
   [today month] == [otherDay month] &&
   [today year] == [otherDay year] &&
   [today era] == [otherDay era]) {
    //do stuff
}

Example of [NSCalendar NSDayCalendarUnit].

NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *components = [cal components:(NSEraCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit) fromDate:[NSDate date]];
NSDate *today = [cal dateFromComponents:components];
components = [cal components:(NSEraCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit) fromDate:aDate];
NSDate *otherDate = [cal dateFromComponents:components];

if([today isEqualToDate:otherDate]) {
//do stuff
}

NSCalendar NSDayCalendarUnit example.

NSCalendar * gregorian = [[NSCalendar alloc]
                               initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents * components =
    [gregorian components:
                 (NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit)
                 fromDate:[NSDate date]];
NSDate * today = [gregorian dateFromComponents:components];

NSCalendar NSMonthCalendarUnit example in Objective C (iOS).

NSCalendar NSMonthCalendarUnit

Calendar Units
Specify calendrical units such as day and month.

enum {
NSEraCalendarUnit = kCFCalendarUnitEra,
NSYearCalendarUnit = kCFCalendarUnitYear,
NSMonthCalendarUnit = kCFCalendarUnitMonth,
NSDayCalendarUnit = kCFCalendarUnitDay,
NSHourCalendarUnit = kCFCalendarUnitHour,
NSMinuteCalendarUnit = kCFCalendarUnitMinute,
NSSecondCalendarUnit = kCFCalendarUnitSecond,
NSWeekCalendarUnit = kCFCalendarUnitWeek,
NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,
NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal,
NSQuarterCalendarUnit = kCFCalendarUnitQuarter,
NSWeekOfMonthCalendarUnit = kCFCalendarUnitWeekOfMonth,
NSWeekOfYearCalendarUnit = kCFCalendarUnitWeekOfYear,
NSYearForWeekOfYearCalendarUnit = kCFCalendarUnitYearForWeekOfYear
NSCalendarCalendarUnit = (1 << 20),
NSTimeZoneCalendarUnit = (1 << 21),
};
typedef NSUInteger NSCalendarUnit;

Constants
NSEraCalendarUnit
Specifies the era unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitEra.
NSYearCalendarUnit
Specifies the year unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitYear.
NSMonthCalendarUnit
Specifies the month unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMonth.
NSDayCalendarUnit
Specifies the day unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitDay.
NSHourCalendarUnit
Specifies the hour unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitHour.
NSMinuteCalendarUnit
Specifies the minute unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMinute.
NSSecondCalendarUnit
Specifies the second unit.
The corresponding value is a double. Equal to kCFCalendarUnitSecond.
NSWeekCalendarUnit
Specifies the week unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeek.
NSWeekdayCalendarUnit
Specifies the weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekday. The weekday units are the numbers 1 through N (where for the Gregorian calendar N=7 and 1 is Sunday).
NSWeekdayOrdinalCalendarUnit
Specifies the ordinal weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekdayOrdinal. The weekday ordinal unit describes ordinal position within the month unit of the corresponding weekday unit. For example, in the Gregorian calendar a weekday ordinal unit of 2 for a weekday unit 3 indicates "the second Tuesday in the month".
NSQuarterCalendarUnit
Specifies the quarter of the calendar as an kCFCalendarUnitSecond.
NSWeekOfMonthCalendarUnit
Specifies the original week of a month calendar unit.
NSWeekOfYearCalendarUnit
Specifies the original week of the year calendar unit.
NSYearForWeekOfYearCalendarUnit
Specifies the year when the calendar is being interpreted as a week-based calendar.
NSCalendarCalendarUnit
Specifies the calendar of the calendar.
NSTimeZoneCalendarUnit
Specifies the time zone of the calendar as an NSTimeZone.

Discussion of [NSCalendar NSMonthCalendarUnit]
Calendar units may be used as a bit mask to specify a combination of units. Values in this enum are equal to the corresponding constants in the CFCalendarUnit enum.
NSCalendar NSMonthCalendarUnit example.

Example of [NSCalendar NSMonthCalendarUnit].

NSCalendar NSMonthCalendarUnit example.

NSCalendar NSYearCalendarUnit example in Objective C (iOS).

NSCalendar NSYearCalendarUnit

Calendar Units
Specify calendrical units such as day and month.

enum {
NSEraCalendarUnit = kCFCalendarUnitEra,
NSYearCalendarUnit = kCFCalendarUnitYear,
NSMonthCalendarUnit = kCFCalendarUnitMonth,
NSDayCalendarUnit = kCFCalendarUnitDay,
NSHourCalendarUnit = kCFCalendarUnitHour,
NSMinuteCalendarUnit = kCFCalendarUnitMinute,
NSSecondCalendarUnit = kCFCalendarUnitSecond,
NSWeekCalendarUnit = kCFCalendarUnitWeek,
NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,
NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal,
NSQuarterCalendarUnit = kCFCalendarUnitQuarter,
NSWeekOfMonthCalendarUnit = kCFCalendarUnitWeekOfMonth,
NSWeekOfYearCalendarUnit = kCFCalendarUnitWeekOfYear,
NSYearForWeekOfYearCalendarUnit = kCFCalendarUnitYearForWeekOfYear
NSCalendarCalendarUnit = (1 << 20),
NSTimeZoneCalendarUnit = (1 << 21),
};
typedef NSUInteger NSCalendarUnit;

Constants
NSEraCalendarUnit
Specifies the era unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitEra.
NSYearCalendarUnit
Specifies the year unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitYear.
NSMonthCalendarUnit
Specifies the month unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMonth.
NSDayCalendarUnit
Specifies the day unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitDay.
NSHourCalendarUnit
Specifies the hour unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitHour.
NSMinuteCalendarUnit
Specifies the minute unit.
The corresponding value is an NSInteger. Equal to kCFCalendarUnitMinute.
NSSecondCalendarUnit
Specifies the second unit.
The corresponding value is a double. Equal to kCFCalendarUnitSecond.
NSWeekCalendarUnit
Specifies the week unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeek.
NSWeekdayCalendarUnit
Specifies the weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekday. The weekday units are the numbers 1 through N (where for the Gregorian calendar N=7 and 1 is Sunday).
NSWeekdayOrdinalCalendarUnit
Specifies the ordinal weekday unit.
The corresponding value is an kCFCalendarUnitSecond. Equal to kCFCalendarUnitWeekdayOrdinal. The weekday ordinal unit describes ordinal position within the month unit of the corresponding weekday unit. For example, in the Gregorian calendar a weekday ordinal unit of 2 for a weekday unit 3 indicates "the second Tuesday in the month".
NSQuarterCalendarUnit
Specifies the quarter of the calendar as an kCFCalendarUnitSecond.
NSWeekOfMonthCalendarUnit
Specifies the original week of a month calendar unit.
NSWeekOfYearCalendarUnit
Specifies the original week of the year calendar unit.
NSYearForWeekOfYearCalendarUnit
Specifies the year when the calendar is being interpreted as a week-based calendar.
NSCalendarCalendarUnit
Specifies the calendar of the calendar.
NSTimeZoneCalendarUnit
Specifies the time zone of the calendar as an NSTimeZone.

Discussion of [NSCalendar NSYearCalendarUnit]
Calendar units may be used as a bit mask to specify a combination of units. Values in this enum are equal to the corresponding constants in the CFCalendarUnit enum.
NSCalendar NSYearCalendarUnit example.

Example of [NSCalendar NSYearCalendarUnit].

NSCalendar NSYearCalendarUnit example.

Thursday, June 13, 2013

Blog Archive

Subscribe To