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Asked: 2026-05-12T21:57:23+00:00

All of my .NET assemblies uses the 1.0.* format for their version numbers. Supposedly

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All of my .NET assemblies uses the 1.0.* format for their version numbers. Supposedly the * gets replaced with the current date and time, translated into a number. What is the formula to translate it back into a date and time?

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  1. Editorial Team

    The AssemblyVersionAttribute documentation states that:

    The default build number increments daily. The default revision number
    is the number of seconds since midnight local time (without taking
    into account time zone adjustments for daylight saving time), divided
    by 2.

    The reference date for the build number isn’t specified. In practice, I’ve found this to be 1 January 2000.

    The date can therefore be reconstructed as follows: 

    var result = new DateTime(2000, 1, 1);
result = result.AddDays(buildNumber);
result = result.AddSeconds(revision * 2);

    Since the reference date isn’t documented, it can’t be guaranteed to always remain unchanged.

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