imporved current week calculation - not finished yet :(

1 files changed, 16 insertions, 2 deletions

diff --git a/www/js/utils.js b/www/js/utils.js
index 09c6333..4f0bb34 100644
--- a/www/js/utils.js
+++ b/www/js/utils.js
@@ -73,6 +73,18 @@ function msToTimeString(time) {
   return h + ':' + m.pad(2) + ':' + s.pad(2) + '.' + hs;
 }
 
+function get_tz_offset() {
+  //
+  // This computes the timezone offset for Europe/Vienna
+  // in seconds. This is either 3600 or 7200 depending on
+  // daylight savings time... 
+  // For Europe/Vienna daylight saving starts on the last
+  // Sunday in March and ends on the last Sunday in October
+  // always at 3am
+  //
+  return 3600; // TODO: calculate the real offset
+}
+
 function get_rd_week() {
   //
   // This computes the current Rivendell Week based on the number
@@ -81,14 +93,16 @@ function get_rd_week() {
   // 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.
+  //  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 = (+new Date()) / 1000;
+  var sEpoch = ((+new Date()) / 1000) + get_tz_offset();
   var week = Math.floor((((sEpoch + 259200)/604800) + 2) % 4) + 1
   return week;
 }