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How to get the week in a month for a date with Javascript

April 14, 2010

Working on my calendar application and I needed to get what week in the current month a day occurs on. Unfortunately I couldn’t find anything like this in the JavaScript Date object so this is the function I came up with

[sourcecode language=“js”] Date.prototype.getMonthWeek = function(){ var firstDay = new Date(this.getFullYear(), this.getMonth(), 1).getDay(); return Math.ceil((this.getDate() + firstDay)/7); } [/sourcecode]

Thanks to mutilator for helping out with the actual math to figure it out.


Written by Jason Brown Father, Veteran, lover of everything tech.