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Asked: 2026-06-05T01:18:26+00:00

I have a DateTime variable defined as DateTime.Now. I need to convert this to

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I have a DateTime variable defined as DateTime.Now. I need to “convert” this to FileTimeUtc. I must be completely misunderstanding this because I assumed this would work:

DateTime RunTime;
RunTime = System.DateTime.Now.ToFileTimeUtc();

But I get the error cannot implicitly convert type long to system.datetime.

Any help? Thanks.

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1 Answer

  1. Editorial Team

    DateTime.ToFileTimeUtc returns a long, not a DateTime. From the documentation:

    A Windows file time is a 64-bit value that represents the number of 100-nanosecond intervals that have elapsed since 12:00 midnight, January 1, 1601 A.D. (C.E.) Coordinated Universal Time (UTC). Windows uses a file time to record when an application creates, accesses, or writes to a file.

    This should be:

    long runTime;
runTime = System.DateTime.Now.ToFileTimeUtc();

    If you just want the current Coordinated Universal Time, and not the Windows file time, you can use:

    DateTime runTime = System.DateTime.UtcNow;

    See UtcNow for details.

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