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Asked: 2026-05-14T16:47:27+00:00

I have been looking for a Javascript algorithms that gives me the week number

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I have been looking for a Javascript algorithms that gives me the week number of a given Date object within a custom fiscal year. The fiscal year of my company starts on 1 September and ends on 31 August.

Say today happens to be September 1st and I pass in a newly instanced Date object to this function; I would expect it to return 1.

Hopefully someone will be able to help me with it.

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1 Answer

  1. Editorial Team

    Say you want the fiscal year for date X.

    if X > September 1st
  week = week_nr(X) - week_nr(Sept 1st) + 1
else
  // We're in a new year
  week = week_nr(X) + week_nr(Sept 1st) - 1

    That should do it – maybe there’s a problem around new year, but easy enough to figure out I guess.

    To get the week number within any year, there are plenty of solutions. Here’s just one of them: http://syn.ac/tech/19/get-the-weeknumber-with-javascript/

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