How to change the format of the date in JavaScript?


I am using one jquery date picker,
with using picker i am getting date in like this format
Friday, May 21, 2010

Now i want to add one day in this date so i think, i can only do if i change the date in exact format like 21/5/2010

I want to only convert that bcz i want to add one day to the particular date.
So what do u suggest me? How can I do that?
Can i do without converting it ?

thanks in advance....

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