datePicker的简单使用方法：（注意连线）

- (IBAction)buttonpressed:(id)sender {

    NSDate *selected = [datePicker date];

  

    NSTimeZone *timeZone3 = [NSTimeZone timeZoneForSecondsFromGMT:3600*8];

    NSDateFormatter *formatter3 = [[NSDateFormatter alloc] init];

    [formatter3 setTimeZone:timeZone3];

    [formatter3 setDateFormat:@"G YYYY-MM-dd EEEE aa HH:mm:ss Z"];

    NSString *dateString = [formatter3 stringFromDate:selected];

    

    NSString *message = [[NSString alloc]initWithFormat:@"The date and time you selected is : %@",dateString];

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Date and Time Selected" message:message delegate:nil cancelButtonTitle:@"Yes,I did" otherButtonTitles: nil];

    [alert show];

    [alert release];

    [message release];

}