GP Notification Scheduler: Set Recurring Schedule to Every 6 Months

gpns-custom-recurring-schedule.php

<?php
/**
 * Gravity Perks // GP Notification Scheduler // Set Recurring Schedule to Every 6 Months
 * https://gravitywiz.com/documentation/gravity-forms-notification-scheduler
 *
 * Instructions:
 *     * Install snippet per https://gravitywiz.com/documentation/how-do-i-install-a-snippet/
 *     * Update $form_id, $notification_id, and if required, $desired_time
 */
add_filter( 'gpns_schedule_timestamp', function ( $timestamp, $notification, $entry, $is_recurring, $current_time ) {
	$form_id         = 6;
	$notification_id = '61f43ccb47dfd';

	// See https://www.php.net/manual/en/datetime.formats.php for supported date/time formats.
	$desired_time = '+6 months 12:00 PM';

	if ( (int) $entry['form_id'] !== (int) $form_id || $notification['id'] !== $notification_id ) {
		return $timestamp;
	}

	/* Only change the timestamp if scheduling the recurring notification. */
	if ( ! $is_recurring ) {
		return $timestamp;
	}

	$local_timestamp = date( 'Y-m-d H:i:s', strtotime( $desired_time ) );
	$utc_timestamp   = strtotime( get_gmt_from_date( $local_timestamp ) );

	return $utc_timestamp;
}, 10, 5 );