iOS 獲取當前的年、月、日、小時、分鐘、秒

獲取當前的date

  NSDate *nowDate = [NSDate date];
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使用NSCalendar 計算詳細的時間

NSCalendar *calendar = [NSCalendar currentCalendar];
NSUInteger unitFlags = NSYearCalendarUnit | //年
                       NSMonthCalendarUnit | //月份
                       NSDayCalendarUnit | //日
                       NSHourCalendarUnit |  //小時
                       NSMinuteCalendarUnit |  //分鐘
                       NSSecondCalendarUnit;  // 秒
NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:nowDate];

NSInteger year = [dateComponent year];
NSInteger month = [dateComponent month];
NSInteger day = [dateComponent day];
NSInteger hour = [dateComponent hour];
NSInteger minute = [dateComponent minute];
NSInteger second = [dateComponent second];
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