1 files changed, 2 insertions, 2 deletions
diff --git a/library/Smarty/libs/plugins/shared.make_timestamp.php b/library/Smarty/libs/plugins/shared.make_timestamp.php
index 7c94e5f59..f87d40c7e 100644
--- a/library/Smarty/libs/plugins/shared.make_timestamp.php
+++ b/library/Smarty/libs/plugins/shared.make_timestamp.php
@@ -21,8 +21,8 @@ function smarty_make_timestamp($string)
     if (empty($string)) {
         // use "now":
         return time();
-    } elseif ($string instanceof DateTime) {
-        return $string->getTimestamp();
+    } elseif ($string instanceof DateTime || (interface_exists('DateTimeInterface', false) && $string instanceof DateTimeInterface)) {
+        return (int) $string->format('U'); // PHP 5.2 BC
     } elseif (strlen($string) == 14 && ctype_digit($string)) {
         // it is mysql timestamp format of YYYYMMDDHHMMSS?
         return mktime(substr($string, 8, 2), substr($string, 10, 2), substr($string, 12, 2),