i didn't get good value when i received notification

What are input_25, input_24 and input_16? Are those all hidden fields in one form?

The 25 (or any of those input numbers) should be the ID of the hidden field where you want to store the date. Can you tell us what field ID you want to store the date in?

Sounds like you have 3 forms as well. You might have to create three functions, each one tied to a different form. But we need to get one working properly before expanding that into 3 forms and 3 different field IDs.

You need to specify the form ID. There are a couple ways to do it.

1) You can create three functions (they need unique names):

// this will apply to form ID 1
add_action('gform_pre_submission_filter_1', 'pre_submission_one');
	// this is the ID of the hidden field for form 1
	function pre_submission_one($form){
	$_POST['input_25'] = date('G:H:s');
	return $form;
}

// this will apply to form ID 2
add_action('gform_pre_submission_filter_2', 'pre_submission_two');
	function pre_submission_two($form){
	// this is the ID of the hidden field for form 2
	$_POST['input_24'] = date('G:H:s');
	return $form;
}

// this will apply to form ID 3
add_action('gform_pre_submission_filter_3', 'pre_submission_three');
	function pre_submission_three($form){
	// this is the ID of the hidden field for form 3
	$_POST['input_16'] = date('G:H:s');
	return $form;
}

Just change the form ID in the first line of the function and match the field ID to correspond with the form ID.

You could also do it with one function, then test the form ID and based on the form ID populate a specific field ID. If the previous approach does not work, I will post this other method for you.

Thank you for the update.