UIDatePicker 显示时间和打印时间不一样

默认是时区为0,如下格式化一下就好啦

UIDatePicker *datePiker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 100, 100, 50)];

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd  HH:mm:ss "];

    NSString *dateString = [dateFormatter stringFromDate:[datePiker date]];