NSDateFormatterStyle - NSDateFormatterShortStyle
The following constants specify predefined format styles for dates and times.
typedef enum {
NSDateFormatterNoStyle = kCFDateFormatterNoStyle,
NSDateFormatterShortStyle = kCFDateFormatterShortStyle,
NSDateFormatterMediumStyle = kCFDateFormatterMediumStyle,
NSDateFormatterLongStyle = kCFDateFormatterLongStyle,
NSDateFormatterFullStyle = kCFDateFormatterFullStyle
} NSDateFormatterStyle;
Constants
NSDateFormatterNoStyle- Specifies no style.Equal to
kCFDateFormatterNoStyle. NSDateFormatterShortStyle- Specifies a short style, typically numeric only, such as “11/23/37” or “3:30pm”.Equal to
kCFDateFormatterShortStyle. NSDateFormatterMediumStyle- Specifies a medium style, typically with abbreviated text, such as “Nov 23, 1937”.Equal to
kCFDateFormatterMediumStyle. NSDateFormatterLongStyle- Specifies a long style, typically with full text, such as “November 23, 1937” or “3:30:32pm”.Equal to
kCFDateFormatterLongStyle. NSDateFormatterFullStyle- Specifies a full style with complete details, such as “Tuesday, April 12, 1952 AD” or “3:30:42pm PST”.Equal to
kCFDateFormatterFullStyle.
Discussion
The format for these date and time styles is not exact because they depend on the locale, user preference settings, and the operating system version. Do not use these constants if you want an exact format.
Example of [NSDateFormatter NSDateFormatterShortStyle]
NSString *theTime = @"3:19 PM";
NSDateFormatter *timeFormatter = [[[NSDateFormatter alloc] init] autorelease];
[timeFormatter setTimeStyle:NSDateFormatterShortStyle];
[timeFormatter setDateStyle:NSDateFormatterNoStyle];
NSDate *date = [timeFormatter dateFromString:theTime];
NSString *theString = [timeFormatter stringFromDate:date];
Example of [NSDateFormatter NSDateFormatterShortStyle]
- (NSString*) humanRelativeDateAndTimeAlt: (NSDate*) date;
{
NSDateFormatter* relativeDateFormatter = [[NSDateFormatter alloc] init];
[relativeDateFormatter setLocale: [NSLocale autoupdatingCurrentLocale]];
[relativeDateFormatter setTimeStyle:NSDateFormatterNoStyle]; // no time for this formatter
[relativeDateFormatter setDateStyle:NSDateFormatterMediumStyle];
[dateFormatter setDoesRelativeDateFormatting:YES]; // relative dates
NSString* datePart = [[self relativeDateFormatter] stringFromDate:date];
NSDateFormatter* timeDateFormatter = [[NSDateFormatter alloc] init];
[timeDateFormatter setLocale:[NSLocale autoupdatingCurrentLocale]];
[timeDateFormatter setDateStyle: NSDateFormatterNoStyle]; // no date for this formatter
[timeDateFormatter setTimeStyle: NSDateFormatterShortStyle]; // does respect 12/24 hour setting
NSString* timePart = [timeDateFormatter stringFromDate:date];
int skipZero = 0; // extra code to remove leading zero if present
if ([[timePart substringToIndex:1] isEqualToString:@"0"]) skipZero = 1;
[relativeDateFormater release];
[timeDateFormatter release];
return [NSString stringWithFormat:@"%@ %@", datePart, [timePart substringFromIndex:skipZero]];
}
Example of [NSDateFormatter NSDateFormatterShortStyle]
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setLocale:[NSLocale currentLocale]];
[formatter setDateStyle:NSDateFormatterNoStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
NSString *dateString = [formatter stringFromDate:[NSDate date]];
NSRange amRange = [dateString rangeOfString:[formatter AMSymbol]];
NSRange pmRange = [dateString rangeOfString:[formatter PMSymbol]];
BOOL is24h = (amRange.location == NSNotFound && pmRange.location == NSNotFound);
[formatter release];
NSLog(@"%@\n",(is24h ? @"YES" : @"NO"));