programmatically setting DatePicker time to current time

setDate: method is used for setting specific date

[yourDatePicker setDate:[NSDate date]];

It will set picker date and time to current date and time.

Try this,

ViewController.h

@interface ViewController : UIViewController
{
  IBOutlet UISwitch *onOffSwitch;
  UIDatePicker *myPicker;
}
-(IBAction)onOffSwitch:(id)sender;

@end

ViewController.m

  - (void)viewDidLoad
    {
    [super viewDidLoad];
    CGRect pickerFrame = CGRectMake(0,250,0,0);
    myPicker = [[UIDatePicker alloc] initWithFrame:pickerFrame];
    [self.view addSubview:myPicker];
    [myPicker release];
    }

    -(IBAction)onOffSwitch:(id)sender{

    if(onOffSwitch.on) {

        NSString *dateStr = @"Tue, 25 May 2010 12:53:58 +0000";
        // Convert string to date object
        NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
        [dateFormat setDateFormat:@"EE, d LLLL yyyy HH:mm:ss Z"];
        NSDate *date = [dateFormat dateFromString:dateStr];
        [myPicker setDate:date];
    }
    else 
    {
        [myPicker setDate:[NSDate date]];
    }
}