//Bunun icin Asagidaki fonksiyonu kullanabilirsiniz.
function SetPCSystemTime(tDati: TDateTime): Boolean;
var
tSetDati: TDateTime;
vDatiBias: Variant;
tTZI: TTimeZoneInformation;
tST: TSystemTime;
begin
GetTimeZoneInformation(tTZI);
vDatiBias := tTZI.Bias / 1440;
tSetDati := tDati + vDatiBias;
with tST do
begin
wYear := StrToInt(FormatDateTime('yyyy', tSetDati));
wMonth := StrToInt(FormatDateTime('mm', tSetDati));
wDay := StrToInt(FormatDateTime('dd', tSetDati));
wHour := StrToInt(FormatDateTime('hh', tSetDati));
wMinute := StrToInt(FormatDateTime('nn', tSetDati));
wSecond := StrToInt(FormatDateTime('ss', tSetDati));
wMilliseconds := 0;
end;
SetPCSystemTime := SetSystemTime(tST);
end;
procedure TForm1.Button1Click(Sender: TObject);
var
tti:tdatetime;
begin
tti:=strtodatetime('11.11.98 14:15:20');
Setpcsystemtime(tti); end;