Half past midnight

half-past-midnight.m

#import <Foundation/Foundation.h>

// Get an NSDate representing 30 minutes past midnight in an arbitrary time zone, and print it in a readable form.
// Tom Harrington, tph@atomicbird.com

int main(int argc, char *argv[]) {
	NSAutoreleasePool *p = [[NSAutoreleasePool alloc] init];

	NSString *timeZoneName = @"America/New_York";
	NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:timeZoneName];
	// For local time zone, use
	//NSTimeZone *timeZone = [NSTimeZone localTimeZone];

	NSLog(@"Zone name: %@", timeZoneName);
	NSLog(@"Zone abberviation: %@", [timeZone abbreviation]);

	NSCalendar *calendar = [NSCalendar currentCalendar];
	[calendar setTimeZone:timeZone];
	

	NSDate *now = [NSDate date];



	NSUInteger componentFlags = NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit;
	NSDateComponents *nowDateComponents = [calendar components:componentFlags fromDate:now];
	[nowDateComponents setHour:0];
	[nowDateComponents setMinute:30];
	[nowDateComponents setSecond:0];
	[nowDateComponents setDay:[nowDateComponents day]+1];
	
	NSDate *midnight = [calendar dateFromComponents:nowDateComponents];
	
	NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
	[formatter setTimeZone:timeZone];
	[formatter setDateFormat:@"MM/dd/yyyy HH:mm:ss VVVV"];
	NSString *midnightString = [formatter stringFromDate:midnight];
	
	NSLog(@"Midnight in %@: %@", timeZoneName, midnightString);

	[p release];
}