Merge commit 'd435f549fe9bbfbea64ed9be36104e7a23f9603c' as 'libraries/action-scheduler'

libraries/action-scheduler/classes/schedules/ActionScheduler_Schedule.php

@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * Class ActionScheduler_Schedule
+ */
+interface ActionScheduler_Schedule {
+	/**
+	 * Get the date & time this schedule was created to run, or calculate when it should be run
+	 * after a given date & time.
+	 *
+	 * @param null|DateTime $after Timestamp.
+	 * @return DateTime|null
+	 */
+	public function next( ?DateTime $after = null );
+
+	/**
+	 * Identify the schedule as (not) recurring.
+	 *
+	 * @return bool
+	 */
+	public function is_recurring();
+}