iOS获取当前时间

- (void)time{

    NSDate *now=[NSDate date];

    NSCalendar *cal=[NSCalendar currentCalendar];

    unsigned int time=NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond;

    NSDateComponents *t=[cal components:time fromDate:now];

    int year=[t year];

    int mouth=[t month];

    int day=[t day];

    int hour=[t hour];

    int minute=[t minute];

    //int second=[t second];

    self.label2.text=[NSString stringWithFormat:@"估计%2d-%2d-%2d %2d:%2d前到账",year,mouth,day,hour,minute];

    NSLog(@"text:%@",self.label2.text);

}