Javascript date, is this my error or did I find a bug?

Question

I have a section of simple Javascript in my application that has a link "Add Day", which adds 1 day to a date. It always works perfectly, except when the date gets to be 11/07/2010, and then the link suddenly will not work any longer. Its really wierd, because it only hangs up on the specific date of 11/07/2010.

How to reproduce error:

1. Navigate to the page here
2. On any date field, click "Today", or just set the date to today.
3. Click "Add Day" until you get to 11/07/2010
4. Now clicking "Add Day" does not work anymore!

Answer 1

The problem is that you're adding the 24 hours to the date to add one day; Daylight Savings Time has thwarted you because 24 hours after 00:00 on November 7th will be 23:00 (for the second time) on November 7th.