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Get Windows Install Date and Time

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Submitted on: 9/24/2003 3:37:32 AM
By: Chrysalis  
Level: Intermediate
User Rating: Unrated
Compatibility:Delphi 7, Delphi 6, Delphi 5

Users have accessed this article 2204 times.
 
 
     Get the date and time of when you Windows NT/2000/XP Operating System was installed and for how long it has been breathing. You must include Registry and DateUtils to your uses section.

 
 
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function GetWindowsInstallationDate():TDate;
var
  Reg : TRegistry ;
  StartDate : TDate; //12:00 A.M. on January 1, 1970
begin
  Reg := TRegistry.Create ;
try
  Reg.RootKey := HKEY_LOCAL_MACHINE ;
  If Reg.OpenKey('SOFTWARE\Microsoft\Windows NT\CurrentVersion', False) then
begin
  StartDate := EncodeDateTime(1970,1,1,0,0,0,0);
  Result := IncSecond(StartDate,Reg.ReadInteger('InstallDate'));
  end else
  begin

    messagedlg('This information is not available on this Operating System',mtError,[mbOK],0);
    exit;
    end;
  finally

  Reg.Free;
  end;
end;



function GetWindowsLife(InstallDate : TDate): String;
const
  SecsPerDay : Integer = 60 * 60 * 24;
  SecsPerHour : Integer = 60 * 60;
  SecsPerMinute : Integer = 60;
  SecsPerSecond : Integer = 1;
var
  TimeDiff, Days, Hours, Minutes, Seconds : Integer;
begin
  TimeDiff := SecondsBetween(Now,InstallDate);

  Days := TimeDiff div SecsPerDay;
  Dec(TimeDiff, Days * SecsPerDay);

  Hours := TimeDiff div SecsPerhour;
  Dec(TimeDiff, Hours * SecsPerhour);

  Minutes := TimeDiff div SecsPerminute;
  Dec(TimeDiff, Minutes * SecsPerminute);

  Seconds := TimeDiff div SecsPerSecond;

  Result := Format('%d Days %d Hours %d Minutes %d Seconds',[Days, Hours, Minutes, Seconds]);
end;



procedure TForm1.Button1Click(Sender: TObject);
begin
  Label1.Caption := 'Install Date: ' + DateTimeToStr(GetWindowsInstallationDate);
  Label2.Caption := 'Windows LifeTime: ' + GetWindowsLife(GetWindowsInstallationDate);
end;


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