Simple date arithmetic in JavaScript

Testing code seen in WebmasterWorld JS Forum:
http://www.webmasterworld.com/javascript/3495404.htm

Sample code to create cookie:

var exdate=new Date();
exdate.setDate(exdate.getDate()+1);
document.cookie="bNumber=" +escape("1_2_3")+ ";expires="+exdate.toGMTString());

[Read Cookie]

This works OK. Adding 1 to the day of the month, even if we're on the last day on the month (ie. 31st Oct), returns the date of the next day (eg. 1st Nov)

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