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

getDate()-1 should do the trick

Quick example:

var day = new Date( "January 1 2008" );
day.setDate(day.getDate() -1);
alert(day);