Set modified time via timestamp

Author: james-allan

includes/data-stores/class-wcs-related-order-store-cached-cpt.php

@@ -286,7 +286,7 @@ protected function update_related_order_id_cache( $subscription, array $related_
 		// On non-HPOS sites, make sure the subscription's modified date is updated when a related order cache is updated.
 		// On HPOS sites this isn't necessary because calling update_meta() or add_meta() will update the modified date.
 		if ( ! wcs_is_custom_order_tables_usage_enabled() ) {
-			$subscription->set_date_modified( current_time( 'mysql' ) );
+			$subscription->set_date_modified( time() );
 			$subscription->save();
 		}