diff -urN ../roundcubemail-1.6.1.orig/tests/Rcmail/Rcmail.php ./tests/Rcmail/Rcmail.php
--- ../roundcubemail-1.6.1.orig/tests/Rcmail/Rcmail.php	2023-04-22 16:59:50.000000000 +0300
+++ ./tests/Rcmail/Rcmail.php	2023-04-22 17:05:07.316043301 +0300
@@ -279,7 +279,7 @@
         $this->assertSame(' Mon', $rcmail->format_date($date, ' D'));
         $this->assertSame('D Monday', $rcmail->format_date($date, '\\D l'));
         $this->assertSame('Jun June', $rcmail->format_date($date, 'M F'));
-        $this->assertSame('6/1/20, 12:20 PM', $rcmail->format_date($date, 'x'));
+        $this->assertSame('6/1/20, 12:20 PM', $rcmail->format_date($date, 'x'));
         $this->assertSame('1591014030', $rcmail->format_date($date, 'U'));
         $this->assertSame('2020-06-01T12:20:30+00:00', $rcmail->format_date($date, 'c'));
     }