ECP > Set recurring event end date

recurrence-end-date.php

<?php
/**
 * Change the end date for recurring events from 1 year in the future to something else.
 * IMPORTANT: Works with Classic Editor only!
 *
 * Usage: Add the snippet to your functions.php file or with a plugin like Code Snippets.
 *
 * @author Andras Guseo
 *
 * Plugins required: Events Calendar Pro
 * Created: March 1, 2024
 */
function tec_custom_end_date() {
	$current_screen = get_current_screen();

	// Load only when adding a new event.
	if ( $current_screen->parent_base === 'edit'
	     && isset ( $_GET[ 'post_type' ] )
	     && $_GET[ 'post_type' ] === 'tribe_events'
	) {
		// Get the saved datepicker format.
		$datepicker_format = Tribe__Date_Utils::datepicker_formats( tribe_get_option( 'datepickerFormat' ) );
		// Convert it to JS date format.
		$js_datepicker_format = strtolower( php_to_js_date_format( $datepicker_format ) );
		?>
		<script>
            function waitForElement(selector, callback) {
                console.log('Waiting for element...');
                let element;
                let intervalID = setInterval(function () {
                    //console.log('Highlight: Selector: ' + selector);
                    element = document.querySelectorAll(selector);
                    //console.log('Highlight: element: ' + element[0]);
                    if (element[0]) {
                        console.log('Element found');
                        clearInterval(intervalID);
                        callback();
                    }
                }, 500); // Check every 500 milliseconds
            }

            function modifyEndDate() {
                // Get today's date
                let futureDate = new Date();

                // If you want to add days...
                // Number of days to add
                const daysToAdd = 14;
                // Add days to today's date
                futureDate.setDate(futureDate.getDate() + daysToAdd);

                // If you want to add months...
                // Number of months to add
                // const monthsToAdd = 3;
                // Add months to today's date
                // futureDate.setMonth(futureDate.getMonth() + monthsToAdd);
                console.log("Future date: " + futureDate);

                // Format the date as YYYY-MM-DD
                formattedDate = futureDate.format('<?php echo $js_datepicker_format ?>');
                console.log("Formatted date: " + formattedDate);
                document.querySelector('.recurrence-row .tribe-field-end_date').value = formattedDate;
            }

            waitForElement('.recurrence-row .tribe-field-end_date', modifyEndDate);
		</script>
		<?php
	}
}

/**
 * Convert a PHP date format to a JS date format.
 *
 * @param string $php_format The PHP date format.
 *
 * @return string The JS date format.
 */
function php_to_js_date_format( $php_format ) {
	$format_map = [
		'd' => 'dd',    // The day of the month (from 01 to 31)
		'j' => 'd',     // The day of the month without leading zeros (1 to 31)
		'm' => 'mm',    // A numeric representation of a month (from 01 to 12)
		'n' => 'm',     // A numeric representation of a month, without leading zeros (1 to 12)
		'Y' => 'yyyy',  // A four digit representation of a year
		'y' => 'yy',    // A two digit representation of a year
	];

	$js_format = strtr( $php_format, $format_map );

	return $js_format;
}

add_action( 'admin_footer', 'tec_custom_end_date' );