How to calculate Mid night time intervals? [closed]
NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"MM.dd.yyyy hh:mm a"];
    NSDate * date1 = [dateFormatter dateFromString:@"01.11.2011 06:30 PM"];
    NSDate * date2 = [dateFormatter dateFromString:@"01.12.2011 12:00 PM"];
    NSTimeInterval interval = [date2 timeIntervalSinceDate:date1];

[dateFormatter setDateFormat:@"hh:mm a"];
NSDate * date1 = [dateFormatter dateFromString:@"06:30 PM"];
NSDate * date2 = [dateFormatter dateFromString:@"12:00 PM"];
NSTimeInterval interval = [date2 timeIntervalSinceDate:date1];

NSTimeInterval rightInterval = 24*3600 + [date2 timeIntervalSinceDate:date1];