time compare

// compare Time - Hour Minute Second - between two dates, ignoring the date part
- (BOOL)isTime:(NSDate *)d1 equalTo:(NSDate *)d2 {
	
	unsigned int flags = NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
	NSCalendar* calendar = [NSCalendar currentCalendar];
	
	NSDateComponents* components1 = [calendar components:flags fromDate:d1];
	NSDateComponents* components2 = [calendar components:flags fromDate:d2];
	
	NSDate* timeOnly1 = [calendar dateFromComponents:components1];
	NSDate* timeOnly2 = [calendar dateFromComponents:components2];
	
	return [timeOnly1 isEqualToDate:timeOnly2];
	
}