Remove category from old posts

Author: bojanfriscic

Posts/remove-category-from-old-posts.php

@@ -0,0 +1,19 @@
+<?php 
+
+// Execute this hook with a cron job
+add_action('my_remove_cats', 'my_remove_cats_exec');
+function my_remove_cats_exec() {
+  $posts = get_posts([
+    'numberposts'     => -1,
+    'category_name'   => 'slug-of-cat-to-remove',
+    'date_query'      => [
+      'after'         => date("Y-m-d H:i:s", strtotime('-180 days', current_time('timestamp'))),
+    ]
+  ]);
+
+  if(!empty($posts)) {
+    foreach($posts as $post) {
+      wp_remove_object_terms($post->ID, 'slug-of-cat-to-remove', 'category');
+    }
+  }
+}