©1996-2017 Roedy Green of Canadian Mind Products
To use the Java Web Start application on this page, you should have a recent Java installed,
preferably 32-bit JRE
(Java Runtime Environment
For most parts of North America, on
Sunday at 2 AM in the morning on 2016-03-13 DST (Daylight Saving Time) ends. You should change all your
clocks forward one hour from 2:00 AM to 3:00
AM. Computer clocks will change themselves. If they don’t, you can use
SetClock to prod them along. You will get an
hour’s less sleep. Don’t set the computer clock manually to adjust for
DST end! Manually adjust your wrist watch, wall clocks, alarm
clocks, microwave, stove, VCR (Videocassette Recorder)…
Radio-Synched clocks watches and timers
should adjust themselves.
If you launch SetClock, now,
(or later) it will set your PC (Personal Computer)
clock to the accurate current time from an atomic clock on the web permitting Windows to
automatically set your PC’s clock forward
one hour at the precise instant.
SetClock is a Java Web Start program that sets your
clock accurately by probing an atomic clock on the web. The atomic clock knows the
precise UTC time, including leap seconds. If you are running
Vista, W2008, W7-32, W7-64, W8-32, W8-64, W2012, W10-32 and W10-64, then you must
be running as an administrator or the SetClock program will
be able to display the time, but will not be able to set it.
Click the orange launch button to run SetClock. Then click Get Time, then
Set Time, then Exit.
SetClock is also available with Java source to download. SetClock is not necessary for Vista, W2008, W7-32, W7-64, W8-32, W8-64, W2012, W10-32 and W10-64,
which has its own atomic clock setting procedure, though you
can use SetClock if you want, or if you suspect your
OS (Operating System) is not maintaining
your clock’s accuracy.
You will get the most accurate results if you don’t have a lot of Internet
activity running at the same time.
For SetClock to work, your PC
clock must be configured to the correct time zone and
automatic daylight saving must be on. You can veryify they are set properly by
left clicking the time in the bottom right corner of the screen
⇒ clicking change date and time settings ⇒ Clicking change time
The clock inside your computer runs on UTC/GMT time, independent of your time zone or
whether daylight saving is in effect. You must not manually adjust it
for daylight saving changes. Your computer software will automatically change the
displayed time to account for daylight saving so long as you have configured the
correct time zone in the control panel. In any case, SetClock will undo the damage
caused by someone fiddling with your computer’s clock.
Java Requirements and Troubleshooting
is a signed Java Web Start application
to Set Clock.
You are welcome to install it on your own website.
If it does not work…
Get New Java
Get New Browser
Install or Repair JWS
- For this Java Web Start to work, you must click grant/accept/always run on this site/I accept the risk
to give it permission to set your PC’s hardware clock.
If you refuse to grant permission, the program may crash with an inscrutable stack dump
on the console complaining about AccessController.checkPermission.
- In the Java Control Panel security tab,
click Start ⇒ Control Panel ⇒
Programs ⇒ Java ⇒ Security, configure medium security
to allow self-signed and vanilla unsigned applets to run.
If medium is not available, or if Java security is blocking you from running the program,
configure high security
and add http://mindprod.com
to the Exception Site List at the bottom of the security tab.
- Often problems can be fixed simply by clicking the reload button on your browser.
- Make sure the Java in your browser is enabled in the security tab of the Java Control panel.
Click Start ⇒ Control Panel ⇒
Programs ⇒ Java ⇒ Security ⇒
Enable Java Content in the browser.
- This signed Java Web Start application
needs 32-bit or 64-bit Java 1.8 or later.
For best results use the latest 1.8.0_131 Java.
- You also need a recent browser.
- It works under any operating system that supports Java
e.g. W2K, XP, W2003, Vista, W2008, W7-32, W7-64, W8-32, W8-64, W2012, W10-32, W10-64, Linux, LinuxARM, LinuxX86, LinuxX64, Ubuntu, Solaris, SolarisSPARC, SolarisSPARC64, SolarisX86, SolarisX64 and OSX
- You should see the Java Web Start above looking much like this
If you don’t, the following hints should help you get it working:
- Optionally, you may permanently install the
Canadian Mind Products code-signing certificate
so you don’t have to grant each time.
- If the above Java Web Start appears to freeze-up, click
Alt-Esc repeatedly to check for any buried permission dialog box.
- If you have certificate troubles,
check the installed certificates
and remove or update any obsolete or suspected defective certificates.
The only certificate used by this program is mindprodcert2017rsa.cer.
- Even if JWS (Java Web Start) complains that the certificate used to sign this application is “invalid”, please click grant/accept anyway.
- If the above Java Web Start does not work, or if it fails to automatically install the latest versions, try running:
on the command line, then click show applications and delete any of the unworking or obsolete applications. Then click show resources and delete any of the unworking or obsolete resources. Then try launching the application again.
- If the above Java Web Start does not work, or if it fails to automatically install the latest versions, try uninstalling the JWS application in the control panel or uninstall it with:
on the command line, and try launching the application again.
- If reinstalling does not work, especially if JWS appears to be using an obsolete *.jnlp file stuck in cache, try bulk uninstalling all JWS apps with:
on the command line, and try launching the application again.
- If the error message says “program not found” the problem is likely a damaged association between *.jnlp files and the javaws.exe program. To learn how to repair the association, click the Repair button below.
- For Firefox, select open with: Java(TM) web start launcher.
- To ensure your Java is up to date, check with Wassup.
First, download it and run it as an application independent of your browser,
then run it online as an Applet to add the complication of your browser.
- If the above Java Web Start does not work,
check the Java console for error messages.
- If the above Java Web Start does not work, you might have better luck with the downloadable version available below.
- This signed Java Web Start application requires modules from the Microsoft C++ Express 10 run time library. Normally they should be automatically statically included. However, if someone recompiled the JNI C++ code without the /MT option, this code will not work unless the vcredist_x86.exe Microsoft C++ Express 10 run time library is preinstalled. You can download it from Microsoft. The symptom of this problem is an UnsatisfiedLinkError or a side-by-side configuration error.
Be sure to get the 2010 version. The older versions have the same name.
- If you are using Mac OS X and would like an improved Look and Feel,
download the QuaQua look & feel
UnZip the contained quaqua.jar
and install it in ~/Library/Java/Extensions
or one of the other ext dirs.
- Upgrade to the latest version of Internet Explorer or another browser.
- Click the Information bar, and then click Allow blocked content. Unfortunately, this also allows dangerous ActiveX code to run. However, you must do this in order to get access to perfectly-safe Java Applets running in a sandbox. This is part of Microsoft’s war on Java.
- Try upgrading to a more recent version of your browser,
or try a different browser e.g. Firefox, SeaMonkey, IE or Avant.
- If you still can’t get the program working
click the red HELP button below for more detail.
- If you can’t get the above Java Web Start working
after trying the advice above and from the red HELP button below,
have bugs to report or ideas to improve the program or its documentation,
please send me an email at.
Unfortunately SetClock only works for Windows computers since it has to use a small
piece of JNI (Java Native Interface) native code to actually set the system clock. If you are
willing to port the tiny piece of JNI
code to your
platform, I would be happy to incorporate it so that SetClock works on your platform too.
Click the dark blue WebStart button at the top of the page to run the
Download information for SetClock
Java source, compiled class files, jar and documentation to run on your own machine as a Java Web Start application.
Runs on any OS that supports Java e.g. W2K, XP, W2003, Vista, W2008, W7-32, W7-64, W8-32, W8-64, W2012, W10-32, W10-64, Linux, LinuxARM, LinuxX86, LinuxX64, Ubuntu, Solaris, SolarisSPARC, SolarisSPARC64, SolarisX86, SolarisX64 and OSX.
First install the most recent Java.
To install, extract the zip download with WinZip,
(or similar unzip utility) into any directory you please,
often J:\ — ticking off the
use folder names option.
To check out the corresponding source from the Subversion repository, use the TortoiseSVN repo-browser to
access setclock source in repository with [Tortoise] Subversion client on wush.net/svn/mindprod/com/mindprod/setclock/.
To run the JWS application, modify the jnlp file to look in the right place for its files, then type:
adjusting as necessary to account for where the jar file is.
download ASP PAD XML program description for the current version of SetClock.
. Full source included.
You may even include the source code, modified or unmodified
in free/commercial open source/proprietary programs that you write and distribute. Non-military use only.