Store the username and the date of the entry approval

gk-approval-data.php

<?php // DO NOT COPY THIS LINE

add_action( 'gravityview/approve_entries/updated',     'gv_custom_function', 10, 1 );
add_action( 'gravityview/approve_entries/approved',    'gv_custom_function', 10, 1 );
function gv_custom_function( $entry_id ){

	$entry = GFAPI::get_entry( $entry_id );
	$form = GFAPI::get_form( $entry['form_id'] );

	$run_on_views = [100,200]; //Change this to the IDs of the Views you'd like to run this code
    	$view_id = GravityView_View::getInstance()->getViewId();

	if( in_array( $view_id, $run_on_views ) ){
        	return false;
    	}
    
	$current_user = wp_get_current_user();
 	if ( ! ( $current_user instanceof WP_User ) ) {
		return;
	}
	
	$field_id_user = 3; // replace 3 with the ID of the field you want to store the username
    	$update_result = GFAPI::update_entry_field( $entry['id'], $field_id_user, $current_user->user_login );

	$field_id_date = 4; // replace 4 with the ID of the field that you want to store the date of the modification
	$updateDate = gmdate("Y-m-d H:i:s");
    	$update_result = GFAPI::update_entry_field( $entry['id'], $field_id_date, $updateDate );
	
}