A getWeek method has been added to the Date object. Any date object can return it's week number (between 1 and 52).
The function can be use like this:
var date = new Date();	// Mon Feb 07 2011 23:35:42 GMT+0100 (CET) {}
date.getWeek();		// 6
bag
tiddlywiki_public
created
Mon, 07 Feb 2011 22:36:56 GMT
creator
pmario
modified
Mon, 07 Feb 2011 22:36:56 GMT
modifier
pmario
tags
date
method