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lfrodrigues

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how to convert UNIX time to DOS time

I need to convert a unix time to dos. I do i do this?
The code must support when february is 29 days long and make the write ajustements.

So any ideas?...

Thanks
                LR
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Lischke

You have posted this question twice! I'd recomend that you delete quickly the other one.

The solution for your problem is:

function UnixTimeToDateTime(const UnixTime: Integer): TDateTime;

var
  FileTime: TFileTime;
  SystemTime: TSystemTime;
  I: Int64;
 
begin
  // first convert unix time to a Win32 file time
  I := Int64(UnixTime) * Int64(10000000) + 116444736000000000;
  FileTime.dwLowDateTime := DWORD(I);
  FileTime.dwHighDateTime := I shr 32;

  // now convert to system time
  FileTimeToSystemTime(FileTime, SystemTime);

  // and finally convert the system time to TDateTime
  Result := SystemTimeToDateTime(SystemTime);
end;


I must admit, I never checked it for the 29. February issue, so this needs to be verified. Therefor I post this as comment only.

Ciao, Mike
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ASKER

I've post a deletion request on the other question. Thanks
I've tested that source and it works iven if february is 29 days. How do i reverse the process??
Yor source is pretty good but i have  has some problems implementing it, since my final componet might be compiled with delphi 1 or 2 and they don't have int64. I would also preffer to use a function with has the source instead of using FileTimeToSystemTime.
Well, to reverse the calculation simply reverse the steps I gave you in the routine above. Is this so hard to do it yourself or do you expect that I give you every single code line ready to build in into your program?

Concerning Delphi 1/2 compatibility: Unfortunately, I can neither write nor test code for these versions as I don't have them. That's stuff you need to do yourself. And what do you mean with: "I would also preffer to use a function with has the source instead of using FileTimeToSystemTime." I have not understood this sentence.

Ciao, Mike
I would like to use use source insstead of using the windows funtion: FileTimeToSystemTime
Please, what source? What should that be? Can you please be a bit more specific?
the source of FileTimeToSystemTime
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Lischke

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it works so thanks
C grading, mmh?
ups it was supost be b sorry...