如何查询文件上上次的修改日期？

//获取文件最后修改日期
function GetFileModifyDate(FileName: String): TDateTime;
var FileHandle : THandle;
LocalFileTime : TFileTime;
DosFileTime : DWORD;
LastModifyTime : TDateTime;
FindData : TWin32FindData;
begin
Result := 0;
FileHandle := FindFirstFile(PChar(FileName), FindData);
if FileHandle <> INVALID_HANDLE_VALUE then
begin
Windows.FindClose(FileHandle);
if (FindData.dwFileAttributes and FILE_ATTRIBUTE_DIRECTORY) = 0 then
begin
FileTimeToLocalFileTime(FindData.ftLastWriteTime, LocalFileTime);
FileTimeToDosDateTime(LocalFileTime,
LongRec(DosFileTime).Hi,LongRec(DosFileTime).Lo);
LastModifyTime := FileDateToDateTime(DosFileTime);
Result:=LastModifyTime;
end;
end;
end;

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