wp_next_scheduled( string $hook, array $args = array() )

Retrieve the next timestamp for an event.

Parameters

$hook

(Required) Action hook to execute when event is run.

$args

(Optional) Arguments to pass to the hook's callback function.

Default value: array()

Return

(false|int) The Unix timestamp of the next time the scheduled event will occur.

Source

File: wp-includes/cron.php 

function wp_next_scheduled( $hook, $args = array() ) {
	$crons = _get_cron_array();
	$key = md5(serialize($args));
	if ( empty($crons) )
		return false;
	foreach ( $crons as $timestamp => $cron ) {
		if ( isset( $cron[$hook][$key] ) )
			return $timestamp;
	}
	return false;
}

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Related

Uses

Uses
Uses Description
wp-includes/cron.php: _get_cron_array()

Retrieve cron info array option.

Used By

Used By
Used By Description
wp-includes/cron.php: wp_schedule_single_event()

Schedules an event to run only once.
wp-includes/post.php: _publish_post_hook()

Hook to schedule pings and enclosures when a post is published.
wp-includes/ms-functions.php: wp_schedule_update_network_counts()

Schedule update of the network-wide counts for the current network.
wp-includes/update.php: wp_version_check()

Check WordPress version against the newest version.
wp-includes/update.php: wp_schedule_update_checks()

Schedule core, theme, and plugin update checks.
wp-includes/functions.php: wp_schedule_delete_old_privacy_export_files()

Schedule a WP_Cron job to delete expired export files.
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Changelog

Changelog
Version Description
WP-2.1.0 Introduced.