javascript - compare dates in different formats

Without using a 3rd party library, you can create new Date objects using both those formats, retrieve the number of milliseconds (since midnight Jan 1, 1970) using getTime() and then simply use >:

new Date("2013/08/26").getTime() > new Date(1381308375118).getTime()

I strongly recommend using datejs library.

Thus this can be written in one single line:

Date.today().isAfter(Date.parse('2013/08/26'))