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Asked: 2026-05-10T17:59:15+00:00

The javascript Date("mm-dd-yyyy") constructor doesn’t work for FF. It works fine for IE. IE

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The javascript Date("mm-dd-yyyy") constructor doesn’t work for FF. It works fine for IE.

  • IE : new Date("04-02-2008") => "Wed Apr 2 00:00:00 EDT 2008"
  • FF2 : new Date("04-02-2008") => Invalid Date

So let’s try another constructor: Date("yyyy", "mm", "dd").

  • IE: new Date("2008", "04", "02"); => "Fri May 2 00:00:00 EDT 2008"
  • FF: new Date("2008", "04", "02"); => "Fri May 2 00:00:00 EDT 2008"
  • IE: new Date("2008", "03", "02"); => "Wed Apr 2 00:00:00 EDT 2008"
  • FF: new Date("2008", "03", "02"); => "Wed Apr 2 00:00:00 EDT 2008"

So the Date("yyyy", "mm", "dd") constructor uses an index of 0 to represent January.

How do I best deal with this other than subtracting 1 from the months?

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1 Answer

  1. It is the definition of the Date object to use values 0-11 for the month field.

    I believe that the constructor using a String is system-dependent (not to mention locale/timezone dependent) so you are probably better off using the constructor where you specify year/month/day as separate parameters.

    BTW, in Firefox,

    new Date("04/02/2008");

    It works fine for me – it will interpret slashes, but not hyphens. This proves my point that using a String to construct a Date object is problematic. Use explicit values for month/day/year instead:

    new Date(2008, 3, 2);
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