Solved

date change

Posted on 2004-04-26
4
198 Views
Last Modified: 2010-04-05
Hey,
I have a little problem with my program, it should change the date to (somedate) run a program, wait 5s and change it back.

Tom

--snip--

procedure TForm1.FormCreate(Sender: TObject);
var
myDate,newDate : TDateTime;
myYear, myMonth, myDay : Word;
begin
DecodeDate(myDate, myYear, myMonth, myDay);
myDate := StrToDate('04/24/2003');
WinExec('c:\bin\date', SW_SHOWNORMAL);
Sleep(5000);
newDate := EncodeDate(myYear, myMonth, myDay);
ReplaceDate(myDate, newDate);

//myDate := RecodeDate(myDate, myYear, myMonth, myDay);
Application.Terminate;

end;
0
Comment
Question by:T0masz
  • 2
4 Comments
 
LVL 12

Expert Comment

by:Ivanov_G
ID: 10920853

   You do not replace the system date ...

   use the API SetLocalTime

   example :

procedure TForm1.Button1Click(Sender: TObject);
var
  SysTime : TSystemTime;
begin
  with SysTime do
    begin
      wYear         := 2004;
      wMonth        := 4;
      wDayOfWeek    := 3;
      wDay          := 4;
      wHour         := 20;
      wMinute       := 51;
      wSecond       := 0;
      wMilliseconds := 0;
    end;
  SetLocalTime(SysTime);
end;
0
 
LVL 12

Expert Comment

by:Ivanov_G
ID: 10920893

  use can use also this function to convert TDateTime to TSystemTime and back

  function SystemTimeToDateTime(const SystemTime: TSystemTime): TDateTime;
  procedure DateTimeToSystemTime(DateTime: TDateTime; var SystemTime: TSystemTime);
0
 
LVL 26

Accepted Solution

by:
Russell Libby earned 500 total points
ID: 10920962
An example:

procedure TForm1.FormCreate(Sender: TObject);
var  myOldDate, myDate:   TDateTime;
     dwMark:              LongWord;
     sysTime:             SYSTEMTIME;
begin

  // Persist the current date
  dwMark:=GetTickCount;
  myOldDate:=Now;

  // Example date setting
  myDate:=StrToDate('04/24/2003');

  // Decode the date (use the current time)
  with sysTime do
  begin
     DecodeDate(myDate, wYear, wMonth, wDay);
     DecodeTime(myOldDate, wHour, wMinute, wSecond, wMilliseconds);
  end;

  // Set the time
  SetLocalTime(sysTime);

  // Do whatever
  // WinExec('c:\bin\date', SW_SHOWNORMAL);
  Sleep(5000);

  // Update with the number of milliseconds that we were delayed
  dwMark:=GetTickCount-dwMark;
  myOldDate:=myOldDate+(dwMark / MSecsPerDay);

  // Reset the date time
  with SysTime do
  begin
     DecodeDate(myOldDate, wYear, wMonth, wDay);
     DecodeTime(myOldDate, wHour, wMinute, wSecond, wMilliseconds);
  end;

  // Set the time
  SetLocalTime(sysTime);

  // Finished
  // Application.Terminate;

end;

The dwMark variable (seeded with GetTickCount) is used for keeping track of how many ms elapsed while the time was changed.

Hope this helps,
Russell

0
 

Author Comment

by:T0masz
ID: 10921181
Thanks to all of you, but rllibby was the closest one, plus I really dont like using TSystemTime because you have to put all the parameters date,time so on and on one station it didnt work correctly for some reason.

Tom
0

Featured Post

Gigs: Get Your Project Delivered by an Expert

Select from freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely and get projects done right.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

776 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question