diff --git wp-includes/formatting.php wp-includes/formatting.php
index 45b5b77..919336d 100644
--- wp-includes/formatting.php
+++ wp-includes/formatting.php
@@ -2291,9 +2291,8 @@ function sanitize_email( $email ) {
  * @return string Human readable time difference.
  */
 function human_time_diff( $from, $to = '' ) {
-	if ( empty( $to ) ) {
+	if ( empty( $to ) )
 		$to = time();
-	}
 
 	$diff = (int) abs( $to - $from );
 
@@ -2330,17 +2329,7 @@ function human_time_diff( $from, $to = '' ) {
 		$since = sprintf( _n( '%s year', '%s years', $years ), $years );
 	}
 
-	/**
-	 * Filter the human readable difference between two timestamps.
-	 *
-	 * @since x.x.x
-	 *
-	 * @param string $since The difference in human readable text.
-	 * @param string $diff The difference in seconds.
-	 * @param string $from Unix timestamp from which the difference begins.
-	 * @param string $to Unix timestamp to end the time difference.
-	 */
- 	return apply_filters( 'human_time_diff', $since, $diff, $from, $to );
+	return $since;
 }
 
 /**