Before you overwrite fullcalendar.js, note that we have changed a few lines
in this file.

Running a diff between the original fullcalendar.js and our modified one:

martin@Thinkpad-T410:~/workspace/airtime/airtime_mvc/public/js/fullcalendar$ diff -u fullcalendar_orig.js fullcalendar.js 
--- fullcalendar_orig.js	2011-04-09 17:13:15.000000000 -0400
+++ fullcalendar.js	2011-11-18 17:03:57.000000000 -0500
@@ -1,6 +1,6 @@
 /**
  * @preserve
- * FullCalendar v1.5.1
+ * FullCalendar v1.5.1-CUSTOM (Changes by Martin Konecny -added primitive support for timezones)
  * http://arshaw.com/fullcalendar/
  *
  * Use fullcalendar.css for basic styling.
@@ -227,7 +227,7 @@
 	var absoluteViewElement;
 	var resizeUID = 0;
 	var ignoreWindowResize = 0;
-	var date = new Date();
+	var date = adjustDateToServerDate(new Date(), options["serverTimezoneOffset"]);
 	var events = [];
 	var _dragElement;
 	
@@ -2275,7 +2275,7 @@
 	function updateCells(firstTime) {
 		var dowDirty = firstTime || rowCnt == 1; // could the cells' day-of-weeks need updating?
 		var month = t.start.getMonth();
-		var today = clearTime(new Date());
+		var today = clearTime(adjustDateToServerDate(new Date(), opt("serverTimezoneOffset")));
 		var cell;
 		var date;
 		var row;
@@ -3108,7 +3108,7 @@
 		var headCell;
 		var bodyCell;
 		var date;
-		var today = clearTime(new Date());
+		var today = clearTime(adjustDateToServerDate(new Date(), opt("serverTimezoneOffset")));
 		for (i=0; i<colCnt; i++) {
 			date = colDate(i);
 			headCell = dayHeadCells.eq(i);
@@ -5205,4 +5205,4 @@
 	
 }
 
-})(jQuery);
\ No newline at end of file
+})(jQuery);


adjustDateToServerDate() function is defined in "js/airtime/schedule/full-calendar-functions.js"

Please make this change before updating!!!