diff --git a/src/includes/class/class.LSldap.php b/src/includes/class/class.LSldap.php
index 9f67cbe4..b1a3a555 100644
--- a/src/includes/class/class.LSldap.php
+++ b/src/includes/class/class.LSldap.php
@@ -332,6 +332,27 @@ class LSldap extends LSlog_staticLoggerClass {
     );
   }
 
+  /**
+   * Format a Datetime object as LDAP date string
+   *
+   * @param DateTime|null $datetime The DateTime object to format (optional, default: now)
+   * @param bool $utc Force UTC timezone (optional, default: false)
+   *
+   * @return string|false LDAP date string, or false
+   */
+  public static function formatDate($datetime=null, $utc=true) {
+    if (is_null($datetime))
+      $datetime = new DateTime('now');
+    elseif (!$datetime instanceof DateTime)
+      return false;
+    $datetime -> setTimezone(timezone_open($utc?'utc':date_default_timezone_get()));
+    $datetime_string = $datetime -> format('YmdHis.uO');
+
+    // Replace +0000 or -0000 end by Z
+    $datetime_string = preg_replace('/[\+\-]0000$/', 'Z', $datetime_string);
+    return $datetime_string;
+  }
+
   /**
    * Check if an attribute exists in specified attributes collection
    *