Initial version

README.md

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+# LGND Expire Sticky Posts
+This plugin automatically expires sticky posts after a set number of days (by default, 14). To use:
+
+- Edit the `lgnd-expire-stickies.php` file to set the appropriate value of `LGND_EXPIRE_STICKIES_DAYS`
+- Install the plugin by uploading it to the Plugins page in your WordPress backend
+- Activate the plugin
+
+Once installed and activated, the plugin will run using wp-cron **hourly**, selecting all sticky posts older than `LGND_EXPIRE_STICKIES_DAYS` and unstickying them.

lgnd-expire-stickies.php

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+<?php
+ /**
+  * Plugin Name: Expire Stickies
+  * Description: Automatically expire sticky posts after a set period of days
+  * Version: 1.0
+  * Author: LGND
+  * Author URI: https://lgnd.com
+  * Contributors: mccahan
+  */
+
+define('LGND_EXPIRE_STICKIES_DAYS', 14);
+
+function lgndCronActivation()
+{
+  if (!wp_next_scheduled('lgnd_expire_stickies'))
+    wp_schedule_event(time()+30, 'hourly', 'lgnd_expire_stickies');
+}
+register_activation_hook(__FILE__, 'lgndCronActivation');
+
+// Delete cronjob on deactivation
+function lgndCronDeactivation()
+{
+  $time = wp_next_scheduled('lgnd_expire_stickies');
+  wp_unschedule_event($time, 'lgnd_expire_stickies');
+}
+register_deactivation_hook(__FILE__, 'lgndCronDeactivation');
+
+// Cronjob function
+function lgndExpireStickiesCron()
+{
+  $before = time() - LGND_EXPIRE_STICKIES_DAYS*86400;
+  $args = [
+    'posts_per_page' => -1,
+    'post__in' => get_option('sticky_posts'),
+    'date_query' => [
+      [
+        'before' => [
+          'year' => date('Y', $before),
+          'month' => date('m', $before),
+          'day' => date('d', $before)
+        ]
+      ]
+    ]
+  ];
+  $query = new WP_Query($args);
+
+  while ($query->have_posts())
+  {
+    $query->the_post();
+    unstick_post(get_the_ID());
+  }
+  wp_reset_postdata();
+}
+add_action('lgnd_expire_stickies', 'lgndExpireStickiesCron');