An NSDate Category With Locale-Aware Calculations for Beginning & End of Day, Week, Month, and Year
Thompson’s Law: Any code that performs sufficiently complex date calculations using naïve arithmetic means has a non-zero chance of causing a Y2K-style collapse of the global technology infrastructure.
If your code defines
kSecondsInWeek–or worst of all–
kSecondsInMonth (seriously, what would you set for that?)… you may want to reconsider. Date and time systems are really, really complicated. Between all of the time zones, calendars and other locale-specific information you should be prepared for, you really can’t get it right yourself.
NSCalendar is all I’m saying.
NSLog(@"Current Time: %@", date); NSLog(@"Beginning of Day:%@", [date beginningOfDay]); NSLog(@"End of Day:%@", [date endOfDay]); NSLog(@"Beginning of Week:%@", [date beginningOfWeek]); NSLog(@"End of Week:%@", [date endOfWeek]); NSLog(@"Beginning of Month:%@", [date beginningOfMonth]); NSLog(@"End of Month:%@", [date endOfMonth]); NSLog(@"Beginning of Year:%@", [date beginningOfYear]); NSLog(@"End of Year:%@", [date endOfYear]);
Result (Note the Time Zone and Daylight Savings Offsets)
Current Time: 2013-10-19 13:29:26 +0000 Beginning of Day: 2013-10-18 22:00:00 +0000 End of Day: 2013-10-19 21:59:59 +0000 Beginning of Week: 2013-10-12 22:00:00 +0000 End of Week: 2013-10-19 21:59:59 +0000 Beginning of Month: 2013-09-30 22:00:00 +0000 End of Month: 2013-10-31 22:59:59 +0000 Beginning of Year: 2012-12-31 23:00:00 +0000 End of Year: 2013-12-31 22:59:59 +0000
“A Cupertino Yankee in Scott Forstall’s Court” is available under the MIT license. See the LICENSE file for more info.