What's the simplest way to decrement a date in Javascript by 1 day?

Question

I need to decrement a Javascript date by 1 day, so that it rolls back across months/years correctly. That is, if I have a date of \'Today\', I want to get the date for \'Ye

Answer 1

setDate(dayValue)

dayValue is an integer from 1 to 31, representing the day of the month.

from https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/Date/setDate

The behaviour solving your problem (and mine) seems to be out of specification range.

What seems to be needed are addDate(), addMonth(), addYear() ... functions.