NSDate for next minute

gistfile1.m

NSDate *now = [NSDate date];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *nowComponents = [calendar components:NSSecondCalendarUnit fromDate:now];
NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
[offsetComponents setMinute:1];
[offsetComponents setSecond:-[nowComponents second]];
NSDate *nextMinute = [calendar dateByAddingComponents:offsetComponents toDate:now options:0];
NSTimeInterval interval = [nextMinute timeIntervalSinceDate:now];