NSDate *now = [NSDate date];NSCalendar *cal = [NSCalendar currentCalendar];unsigned int unitFlags = NSWeekdayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;NSDateComponents *dd = [cal components:unitFlags fromDate:now];NSInteger week = [dd weekday];hour = [dd hour];minute = [dd minute];NSInteger second = [dd second];原文：http://www.cnblogs.com/huangjl/p/3907016.html