gistfile1.m

NSDateComponents *thisDayComponents = [[NSDateComponents alloc] init];
[thisDayComponents setYear:2010];
[thisDayComponents setMonth:9];
[thisDayComponents setDay:1];
	
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSString *aDate = [[gregorian dateFromComponents:thisDayComponents] descriptionWithLocale:nil];
NSLog(@"day:%i  date:%@", [thisDayComponents day], aDate);

// result => day:1  date:2010-08-31 22:00:00 GMT