unit Unit1;    interface    uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;    type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;    var
  Form1: TForm1;
function LocaleDateTimeToGMTDateTime(const Value: TDateTime) : TDateTime;    function GMTDateTimeToLocaleDateTime(const Value: TDateTime) : TDateTime;    implementation    {$R *.DFM}    const
  MinsPerDay = 24*60;    function GetGMTBias : Integer;
var
  info: TTimeZoneInformation;
  Mode: DWord;
begin
  Mode := GetTimeZoneInformation(info);
  Result := info.Bias;
  case Mode of
    TIME_ZONE_ID_INVALID:
    begin
      RaiseLastWin32Error
    end;
    TIME_ZONE_ID_STANDARD:
    begin
      Result := Result info.StandardBias
    end;
    TIME_ZONE_ID_DAYLIGHT:
    begin
      Result := Result info.DaylightBias
    end;
  end;
end;    function LocaleDateTimeToGMTDateTime(const Value: TDateTime) : TDateTime;
begin
  Result := Value (GetGMTBias/MinsPerDay);
end;    function GMTDateTimeToLocaleDateTime(const Value: TDateTime) : TDateTime;
begin
  Result := Value-(GetGMTBias/MinsPerDay);
end;    procedure TForm1.Button1Click(Sender: TObject);
begin
  caption:=inttostr(GetGMTBias);
end;    end.