本文整理自网络，侵删。
const
FILE_CREATE_TIME = 0; //创建时间
FILE_MODIFY_TIME = 1; //修改时间
FILE_ACCESS_TIME = 3; //访问时间
function TForm1.GetFileLastAccessTime(a_FileName: string;
a_Flag: Byte): TDateTime;
var
ffd: TWin32FindData;
dft: DWord;
lft: TFileTime;
h: THandle;
begin
h:=FindFirstFile(PChar(a_FileName),ffd);
if h<>INVALID_HANDLE_VALUE then
begin
case a_Flag of
FILE_CREATE_TIME:FileTimeToLocalFileTime(ffd.ftCreationTime,lft);
FILE_MODIFY_TIME:FileTimeToLocalFileTime(ffd.ftLastWriteTime,lft);
FILE_ACCESS_TIME:FileTimeToLocalFileTime(ffd.ftLastAccessTime,lft);
else
FileTimeToLocalFileTime(ffd.ftLastAccessTime,lft);
end;
FileTimeToDosDateTime(lft,LongRec(dft).Hi,LongRec(dft).Lo);
Result := FileDateToDateTime(dft);
Windows.FindClose(h);
end
else
Result:=0;
end;
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