NSCalendar components fromDate example objc

NSCalendar components:fromDate: method is used to convert a NSDate object into YY/MM/DD/HH/MM/SS format. It returns an object of NSDateComponents type. The conversion is performed only through the calendar object (It's very natural. Different calendar system outputs different yy/mm/dd and so on). An Example of NSCalendar components:fromDate: is shown below. Components takes BitMasks which specifies which components of the date will be extracted. [NSCaldendar components:fromDate: example]

Declaration.

- (NSDateComponents *)components:(NSUInteger)unitFlags fromDate:(NSDate *)date

Parameters

unitFlags

The components into which to decompose date—a bitwise OR of NSCalendarUnit constants.

[List of NSCalendar Calendar Units] 

 

// Following list is quoted from Apple Developer Site.

//

enum {
   NSEraCalendarUnit = kCFCalendarUnitEra,
   NSYearCalendarUnit = kCFCalendarUnitYear,
   NSMonthCalendarUnit = kCFCalendarUnitMonth,
   NSDayCalendarUnit = kCFCalendarUnitDay,
   NSHourCalendarUnit = kCFCalendarUnitHour,
   NSMinuteCalendarUnit = kCFCalendarUnitMinute,
   NSSecondCalendarUnit = kCFCalendarUnitSecond,
   NSWeekCalendarUnit = kCFCalendarUnitWeek,
   NSWeekdayCalendarUnit = kCFCalendarUnitWeekday,
   NSWeekdayOrdinalCalendarUnit = kCFCalendarUnitWeekdayOrdinal
   NSQuarterCalendarUnit = kCFCalendarUnitQuarter,
};
typedef NSUInteger NSCalendarUnit;

date

The date for which to perform the calculation.

[Example]

  // Get current date and translate it into YY/MM/DD format.

  //

    NSDate              *today = [NSDate date];

    NSCalendar          *calendar = [NSCalendar currentCalendar];

    NSDateComponents    *todayComp = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:today];