wp_next_scheduled() │ WP 2.1.0

Retrieve the next timestamp for an event.

Used By: wp_schedule_single_event()
1 time — 0.001667 sec (very slow) | 50000 times — 3.12 sec (fast) | PHP 7.2.5, WP 4.9.8

No Hooks.

Return

Int|false. The Unix timestamp of the next time the event will occur. False if the event doesn't exist.

Usage

wp_next_scheduled( $hook, $args );
$hook(string) (required)
Action hook of the event.
$args(array)
Array containing each separate argument to pass to the hook's callback function. Although not passed to a callback, these arguments are used to uniquely identify the event, so they should be the same as those used when originally scheduling the event.
Default: empty array

Changelog

Since 2.1.0 Introduced.

Code of wp_next_scheduled() WP 5.9.3

wp-includes/cron.php 
function wp_next_scheduled( $hook, $args = array() ) {
	$next_event = wp_get_scheduled_event( $hook, $args );
	if ( ! $next_event ) {
		return false;
	}

	return $next_event->timestamp;
}

cron (schedule)