--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/client/src/lib/session.js	Thu Nov 22 07:07:12 2018 +0100
@@ -0,0 +1,38 @@
+/*
+ * This is Free Software under GNU Affero General Public License v >= 3.0
+ * without warranty, see README.md and license for details.
+ * 
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ * License-Filename: LICENSES/AGPL-3.0.txt
+ * 
+ * Copyright (C) 2018 by via donau 
+ *   – Österreichische Wasserstraßen-Gesellschaft mbH
+ * Software engineering by Intevation GmbH
+ * 
+ * Author(s):
+ * Thomas Junk <thomas.junk@intevation.de>
+ */
+
+/**
+ * Compares whether session is current
+ * based on the expiry information and the
+ * current date
+ *
+ * @param  {number} expiresFromPastSession
+ */
+function sessionStillActive(expiresFromPastSession) {
+  if (!expiresFromPastSession) return false;
+  const now = Date.now();
+  const stillActive = now < expiresFromPastSession;
+  return stillActive;
+}
+/**
+ * Converts a given unix time to Milliseconds
+ *
+ * @param  {string} timestring
+ */
+function toMillisFromString(timestring) {
+  return timestring * 1000;
+}
+
+export { sessionStillActive, toMillisFromString };