diff --git a/phpBB/includes/datetime.php b/phpBB/includes/datetime.php
index ec2cb3f471..0cb4c79a10 100644
--- a/phpBB/includes/datetime.php
+++ b/phpBB/includes/datetime.php
@@ -44,24 +44,6 @@ class phpbb_datetime extends DateTime
 		parent::__construct($time, $timezone);
 	}
 
-	/**
-	* Returns a UNIX timestamp representation of the date time.
-	*
-	* @internal This method is for backwards compatibility with 5.2, hence why it doesn't use our method naming standards.
-	* @return int UNIX timestamp
-	*/
-	public function getTimestamp()
-	{
-		static $compat;
-
-		if (!isset($compat))
-		{
-			$compat = !method_exists('DateTime', 'getTimestamp');
-		}
-
-		return !$compat ? parent::getTimestamp() : (int) parent::format('U');
-	}
-
 	/**
 	* Formats the current date time into the specified format
 	*