Question

I have an NSDate (lets call it x), 12 September, 2012 10:18PM (GMT). I want to convert x to a minute before my current time zone’s (EST) midnight. So, x represented in EST with NSDateFormatter after conversion would be 12 September, 2012 11:59PM (EST). What’s the best way to do this?
Thanks

Answer 1

Take a look at NSDateComponents: https://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/NSDateComponents_Class/Reference/Reference.html

I believe you’ll need to convert the NSDate to NSDateComponents, set the time to 11:59PM, then convert back to NSDate.

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [calendar components:(NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit) fromDate:date];
[components setHour:23];
[components setMinute:59];
NSDate *convertedDate = [calendar dateFromComponents:components];

NSLog(@"date=%@, convertedDate=%@", date, convertedDate);