intmain(intargc,constchar* argv[]) {

// ?c語言中 ?

NSDate*data1=[NSDatedate];

NSLog(@"%@",data1);

//時間傳喚

NSTimeZone*zone=[NSTimeZonesystemTimeZone];

NSIntegerseconds=[zonesecondsFromGMTForDate:data1];

NSDate*data2=[data1dateByAddingTimeInterval:seconds];

NSLog(@"%@",data2);

//??? y:年M：月d：日h：小時(24進制) ? m:分s：秒

//時間格式規定

NSDateFormatter*formatter=[[NSDateFormatteralloc]init];

formatter.dateFormat=@"yyyy-MM-dd hh:mm:ss";

//時間與字符串轉喚

//時間轉換字符串，，獲得的是當前時區

NSString*dateStr=[formatterstringFromDate:data1];

NSLog(@"%@",dateStr);

//格尼時間

NSDate*date3=[formatterdateFromString:dateStr];

NSLog(@"%@",date3);

//時間日歷相關操作

NSCalendar*calendar=[[NSCalendaralloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

NSCalendarUnitunit=NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond;

NSDateComponents*components=[calendarcomponents:unitfromDate:data1];

NSLog(@"%ld",components.year);

NSLog(@"%ld",components.month);

NSLog(@"%ld",components.day);

NSLog(@"%ld",components.hour);

NSLog(@"%ld",components.minute);

NSLog(@"%ld",components.second);

return0;

//加個??

}