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Convert to DateTime object

Posted on 2004-08-19
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Last Modified: 2012-06-21
I have a FileData object called myfile.

How do I convert the lastWriteTime_highDateTime and lastWriteTime_lowDateTime properties to a normal DateTime object?

Please ask if need more info.

Thanks
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Question by:imt21
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Expert Comment

by:NipNFriar_Tuck
ID: 11842094
Why not use FileInfo? i.e.

FileInfo fi = new FileInfo( "fullFilePath" );
DateTime dt = fi.LastWriteTime;

Other than that what type of object is lastWriteTime_*?
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by:chmohan
ID: 11842172
System.DateTime dtTime = new DateTime();
dtTime.Hour,dtTime.Minutes.dtTime.Year ,assign these values from your property values
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eternal_21 earned 250 total points
ID: 11842238
This should do the trick:

  [System.Runtime.InteropServices.DllImport("kernel32.dll", SetLastError=true)] static extern int FileTimeToSystemTime(ref FILETIME lpFileTime, ref SystemTime lpSystemTime);

    struct FILETIME
    {
      public int dwLowDateTime;
      public int dwHighDateTime;
    }

    struct SystemTime
    {
      public short wYear;
      public short wMonth;
      public short wDayOfWeek;
      public short wDay;
      public short wHour;
      public short wMinute;
      public short wSecond;
      public short wMilliseconds;
    }

    static DateTime GetDateTime(int dwLowDateTime, int dwHighDateTime)
    {
      FILETIME fileTime = new FILETIME();
      fileTime.dwLowDateTime = dwLowDateTime;
      fileTime.dwHighDateTime = dwHighDateTime;

      SystemTime systemTime = new SystemTime();
      FileTimeToSystemTime(ref fileTime, ref systemTime);

      return new DateTime(systemTime.wYear, systemTime.wMonth, systemTime.wDay, systemTime.wHour, systemTime.wMinute, systemTime.wSecond, systemTime.wMilliseconds);
    }

Just call GetDateTime with your low and high time properties from your FileData object.
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by:eternal_21
ID: 11842591
imt21, could you provide a sample of the values in lastWriteTime_highDateTime, and lastWriteTime_lowDateTime along with the actual Date/Time reported by Windows?
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Expert Comment

by:eternal_21
ID: 11842905
Actually, nevermind my last request - I found the values I needed to test.  The .NET Framework offers a method that will allow you to avoid another API call:

  DateTime.FromFileTimeUtc(dwLowDateTime + ((long)dwHighDateTime << 32))

Will return a DateTime object based on the low and high time properties from your FileData object (Which will match the FileTimeToSystemTime call).

Hope this helps!
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