webmail / Uebimiau shows the wrong date on 64-bit systems

If you have a weird timestamp when viewing the email in Uebimiau, then edit:

/var/www/html/webmail/smarty/plugins/shared.make_timestamp.php

and change:

if(empty($string)) {
  $string = "now";
}
$time = strtotime($string);

to

if(empty($string)) {
  $string = "now";
} else if(is_numeric($string)) {
  return (int)$string;
}
$time = strtotime($string);