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Asked: 2026-05-30T03:57:36+00:00

So, this is driving me nuts and I’m not sure if it’s a bug

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So, this is driving me nuts and I’m not sure if it’s a bug or if I’m missing something obvious. Can someone please explain to me why a month is added to the following statement in mongo 2.0.2

# mongo
MongoDB shell version: 2.0.2
> new Date()
ISODate("2012-02-19T04:58:56.988Z")
> new Date(2012, 02, 19, 04, 58, 56)
ISODate("2012-03-19T04:58:56Z")
> new Date(2012, 01, 19, 04, 58, 56)
ISODate("2012-02-19T04:58:56Z")

Notice how a month is added when I specify the date. Whiskey Tango Foxtrot?

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1 Answer

  1. Editorial Team

    MongoDB uses JavaScript as its interface language. The month in the JavaScript Date constructor is zero based. From the fine manual:

    month
    Integer value representing the month, beginning with 0 for January to 11 for December.

    Note the 0 for January. This sort of thing is one of the reasons that MongoDB tends to use their own ISODate function instead of new Date:

    […] ISODate is a thin wrapper around the Date constructor to fix some of it’s shortcomings. It returns a normal Date object with all of the normal methods that javascript Date methods support.

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