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So I ran into this little issue ... (thanks to user Granny646)
Since Windows 8, it seems that Windows doesn't like file dates prior to 1980.
This seems a mixed bag of certain functions (for example FileSetDate) not properly supporting dates like that and the Windows File Explorer not displaying it either.
Again: Windows File Explorer will not show a date when file date is set to a date to prior 1980.
Example:
However: this is not a filesystem limitation (tested with NTFS, not and issue under macOS and Linux either).
So how do we set the file date with a date like that in Lazarus Pascal?
I found a little function for that (minor modification from this one by howardpc):
uses ... FileUtil, Windows ...
...
function SetFileDate(const aFilename: string; aDate: TDateTime): boolean;
var
fileHandle : THandle;
fileTime : TFILETIME;
LFileTime : TFILETIME;
LSysTime : TSystemTime;
begin
Result:=False;
if not(DirectoryExists(aFilename) or FileExists(aFilename)) then exit;
try
DecodeDate(aDate, LSysTime.Year, LSysTime.Month, LSysTime.Day);
DecodeTime(aDate, LSysTime.Hour, LSysTime.Minute, LSysTime.Second, LSysTime.Millisecond);
if SystemTimeToFileTime(LSysTime, LFileTime) then
begin
if LocalFileTimeToFileTime(LFileTime, fileTime) then
begin
fileHandle:=FileOpenUTF8(aFilename, fmOpenReadWrite or fmShareExclusive);
if SetFileTime(fileHandle, fileTime, fileTime, fileTime) then
Result:=True;
end;
end;
finally
FileClose(fileHandle);
end;
end;
Hope this is useful to someone ....