Official Times Across Canada
The above time zone map runs a clock in each Canadian
time
zone. UTC (Coordinated Universal Time - the modern implementation of
Zulu time or GMT) is also shown. For more information on Canadian time
zones consult following web
page.
The map is a Java applet that gets its time initially
from Canada's official time source:
NRC's atomic clocks.
The time offset of your computer from NRC official time is displayed at
the top of the map. The network delay is removed. The offset is
calcuated once. After that the clocks will drift along with your
computer's clock. After 10 minutes, the browser will return to this
home page.
To run these clocks, you will need a Java enabled
browser with "Enable Java" set in the configuration
options. If the time does not display correctly on your system, try
clicking refresh. Check the technical
notes below. If it still does not work, then you can try
using the static Web
Clock.
A
box at the top of the sceen will show the offset your computer clock
has with respect to official time. If this offset is a few seconds, you
can adjust your computer's clock manually or automatically with an
SNTP/NTP application.
If this offset is thousands of seconds, then check your computer's
settings for the date, the time zone, or the daylight saving time
setting.
The clocks are running in Java applets that were loaded
with the web page. To check to see if your browser is java enabled, do
the java
test at the Java home page. If you need to download the Java
Runtime Environment (JRE)
for your browser, follow the instructions at the Java home page. The
java applet needs to communicate with an NRC time server. It uses UDP
port 7501 to exchange packets. If you are using a firewall, you may
need to open this port for incoming traffic.
The applet
uses the SNTP protocol to request time from the NRC time server. The
exchange of time stamps allows it to calculate the network delay and
time offset with your computer's clock. Therefore the time displayed,
attempts to compensate for these errors. The SNTP protocol can not
compensate for network asymmetries, so you may see small differences
each time you refresh the page.
A Java applet does NOT
adjust your computer's clock. It runs in a safe environment and can not
affect your computer. However if you make adjustments to your
computer's clock, either manually or automatically with some
NTP application,
the applet will have to restart and get a proper time reference again.
You will see a message in the message box, the display will stop for 5
seconds and you will hear a ding. In some operating systems, the system
clock may be adjusted by simply opening an application. If you need to
maintain accurate time on your computer, you should use an
SNTP/NTP application. Some operating systems may already have
one built in.
The
Java Clock may not work on all configurations of Operating Systems and
browsers. Ensure that your software is up to date. The clock has been
tested on the following systems:
- Windows XP, Windows 2000
- Internet Explorer version 7.0
- Netscape version 8.1.2
- Opera version 9.10
- Mozilla Firefox version 2.0
- SlimBrowser version 4.08
- Mac OS-X
- Safari version 1.2.2
- Internet Explorer version 5.2
- Linux
- Mozilla Firefox version 1.0
- Konqueror version 3.1.4
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