iOS 获取当前时间

 //获取系统时间

    NSDate *  senddate=[NSDate date];

    NSDateFormatter  *dateformatter=[[NSDateFormatter alloc] init];

    [dateformatter setDateFormat:@"HH:mm"];

    NSString *  locationString=[dateformatter stringFromDate:senddate];

    NSLog(@"-------%@",locationString);

    //获取系统时间2

    NSCalendar  * cal=[NSCalendar  currentCalendar];

    NSUInteger  unitFlags=NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit;

    NSDateComponents * conponent= [cal components:unitFlags fromDate:senddate];

    NSInteger year=[conponent year];

    NSInteger month=[conponent month];

    NSInteger day=[conponent day];

    NSString *  nsDateString= [NSString  stringWithFormat:@"%4d年%2d月%2d日",year,month,day];

    NSLog(@"+++++++++++++%@",nsDateString);