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diff --git a/www/js/utils.js b/www/js/utils.js
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+/*
+ *  rhrdweb
+ *
+ *  Copyright (C) 2016 Christian Pointner <equinox@helsinki.at>
+ *
+ *  This file is part of rhrdweb.
+ *
+ *  rhrdweb is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  any later version.
+ *
+ *  rhrdweb is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with rhrdweb. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+'use strict';
+
+Number.prototype.pad = function(size) {
+  var s = String(this);
+  while (s.length < (size || 2)) {s = "0" + s;}
+  return s;
+}
+
+var weekday = new Array(7);
+weekday[0] = 'Sonntag';
+weekday[1] = 'Montag';
+weekday[2] = 'Dienstag';
+weekday[3] = 'Mittwoch';
+weekday[4] = 'Donnerstag';
+weekday[5] = 'Freitag';
+weekday[6] = 'Samstag';
+
+var weekday_short = new Array('So', 'Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa');
+
+function format_datetime(d) {
+  if(Object.prototype.toString.call(d) !== '[object Date]') {
+    return '-';
+  }
+  if (d.toString() === 'Invalid Date') {
+    return '-';
+  }
+  var datetimestr = weekday_short[d.getDay()];
+  datetimestr += ' ' + Number(d.getDate()).pad(2);
+  datetimestr += '.' + Number(d.getMonth() + 1).pad(2);
+  datetimestr += '.' + d.getFullYear();
+  datetimestr += ' ' + Number(d.getHours()).pad(2);
+  datetimestr += ':' + Number(d.getMinutes()).pad(2);
+  datetimestr += ':' + Number(d.getSeconds()).pad(2);
+  return datetimestr;
+}
+
+function get_rd_week(msEpoch) {
+  //
+  // This computes the current Rivendell Week based on the number
+  // of weeks since epoch.
+  //
+  // Explanation:
+  //  epoch was at 01.01.1970 which was a Thursday.
+  //  Monday in that week is (s-from-epoch + 3*24*60*60) seconds ago.
+  //  This needs to be adjusted by the timezone offset for Europe/Vienna
+  //  which is of course not constant (damn you daylight savings time)
+  //  Divide this by (7*24*60*60) and you get the number of
+  //  weeks since the Monday in the week of epoch adjusted for timezone offsets.
+  //  This week had week number 3 so add an offset of 2 and
+  //  get the modulo of 4. This rounded down gives you the current week
+  //  with 0 meaning Week 1. So add 1 to that number and you will get
+  //  the current RD week.
+  //
+  var sEpoch = msEpoch / 1000 ;
+  var week = Math.floor((((sEpoch + 259200)/604800) + 2) % 4) + 1;
+  return week;
+}