Setting the system time with only Java.

Am trying trying to write a 100% pure java Alarm Clark. One feature I wish to have is to syncronize with the atomic clock.
Is this possible in Java. All I have been able to find is system dependent ways to do it through exec.
Thank you,
Jacob

What do you mean "atomic clock"? Do you wish to synchronize your alarm clock with GMT? If so, you can directly access the National Institute of Standards and Technology's atomic clock on-line...see the site :
http://www.boulder.nist.gov/timefreq/service/its.htm
You could then get the local time from the computer, thus appropriately adjusting your clock. Synchronizing your system clock to the atomic clock is system-dependent, as mentioned by the other respondent.

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How do I set the system time?

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The system time can be read using System.currentTimeMillis(), but, how can I set it?
Thanks

several approaches:
you could use the OS function to set and call it via Runtime.exec().
For WIndows e.g.: "time 08:15:00" to set the system time.
another solution: http://www.rgagnon.com/javadetails/java-0285.html

How to set the system time in the program

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How do we update the system time inside java programme.

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Setting the system property in java application

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System.getProperty(..)
System.setProperty(..) is this what you are asking for?
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Filip
In article <396d0a93$[email protected]>, [email protected] says...
>
Hi,
I want to make a connection to https://URL through my java application class
which will be deployed in the weblogic server. Could any one help by
telling how could I set the system properties in my java application. If I
pass the value in the java class do I have to change any value in the
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Sirisha
Filip Hanik
Software Architect
XMarkstheSpot.com
[email protected]

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Hi All
I would like to compare the system time with an existing time values which is allready there in String format..
i mean i would like to check if the SysTime is inbetween 6:30 and 14:00
I accomplished this in Oracle ..
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Thanks in advance..,.,

import java.util.Calendar;
Calendar rightNow = Calendar.getInstance(); // gets the current date and time to millisec
Calendar earlyTime = Calendar.getInstance().set(Calendar.HOUR_OF_DAY, 6).set(Calendar.MINUTE, 30);
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hi There,
I need to set the system time on a pure java application.
what is the proper way to do so? (I can't find any system property which corresponds to the system clock).
if it's platform dependent , then I need to do so on win2000 and on linux RH.
thanks

I don't know about Windows but on RedHat, I would use the date command. Check the man pages for date and look at the -s or --set options. Do a Runtime.exec to execute that.
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Is there any danger in setting the system date/time to a prior date?

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To compare given time with the system time

i need to compare the given time with system time.i dont know how to compare with system time
in my application i need to end the time when both time is equal i need to give permission to access my page
thank u
plz help me

Date d =new Date();
System.out.println(d);
Date d1 =new Date("04/28/2006 16:37");
System.out.println(" "+d.getTime()+" "+d1.getTime());you can use like this. d1 contains the user date
as u mentioned
startTime = new Date( "04/28/2006 12:37");
EndTime = new Date( "04/28/2006 18:37");
if curTime = new Date();
then you can compare like
if(curTime.after(startTime) && curTime.before(EndTime)
hope it will work

Setting the system time with only Java.

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