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Editorial Team
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Editorial Team
Asked: May 22, 20262026-05-22T02:49:25+00:00 2026-05-22T02:49:25+00:00

Does anyone possibly recognize the following value 40195.315752 as a date? I need to

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Does anyone possibly recognize the following value “40195.315752” as a date? I need to convert/format this value-based date to a System.DateTime object, but don’t understand it’s format.

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  1. Editorial Team
    Editorial Team
    2026-05-22T02:49:25+00:00Added an answer on May 22, 2026 at 2:49 am

    It’s a serial date-time, which means it’s the number of days since a particular date. Note that you need to know the date which it is an offset to. In Excel, that would be Jan 1st, 1900, which makes your date 17/01/2010 07:34:41, but other programs will vary.

    Another common start date is 1st January 1970 (Unix Epoch).

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