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How to change System DATE and TIME ?

Posted on 2001-09-01
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Last Modified: 2008-03-10
How we can change the current system's Date and time from a Java application ?

Thanks in advance !

:-)

c_sh.
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Question by:c_sh
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5 Comments
 
LVL 16

Expert Comment

by:Valeri
ID: 6447458
Listening...
0
 

Expert Comment

by:muhotrepius
ID: 6447530
One way i see is by using RunTime.exec(...) but that's OS dependant...
Or write a native library and use JNI.
0
 
LVL 4

Accepted Solution

by:
sdussinger earned 111 total points
ID: 6447744
Try this. It'll work on both Windows and Linux (although on Linux you'll need to run it as root, since normal users can't change the date):

-----------------------------------------------------------

import java.lang.Process;
import java.lang.Runtime;
import java.text.*;
import java.util.*;

public class SetDate
{
  static Process p;
  static Runtime rt=Runtime.getRuntime();

  public static void main(String args[])
  {

      String sourceDate = "2001-01-01T00:00:00";

      SimpleDateFormat sourceFormat = new SimpleDateFormat ("yyyy-MM-dd'T'hh:mm:ss");
      SimpleDateFormat winDateFormat = new SimpleDateFormat ("MM/dd/yy");
      SimpleDateFormat winTimeFormat = new SimpleDateFormat ("hh:mm:ss");
      SimpleDateFormat linuxDateTimeFormat = new SimpleDateFormat ("MMddhhmmyy.ss");

      Date d = sourceFormat.parse (sourceDate, new ParsePosition (0));

      String osName = System.getProperty("os.name");

      try
      {

          if (osName.equalsIgnoreCase ("linux"))
          {
            String linuxDate = linuxDateTimeFormat.format (d);

            p = rt.exec ("date " + linuxDate);
          }
          else
          {

            String winDate = winDateFormat.format (d);
            String winTime = winTimeFormat.format (d);

            p = rt.exec("cmd /c date " + winDate);
            p = rt.exec ("cmd /c time " + winTime);
          }
      }
      catch(Exception e)
      {
          e.printStackTrace();
      }
  }
}

-----------------------------------------------------------

HTH

--Steve
0
 

Author Comment

by:c_sh
ID: 6449775
Thanks to all of you for giving attention to this problem, and a special thanks for Steve.

Steve, your code showed me the right direction to move on. Thanks for the cooperation.


:-)
c_sh.
0
 
LVL 4

Expert Comment

by:sdussinger
ID: 6451140
Glad I could help...

--Steve
0

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