Time - under construction, please return later

This page contains various items about time. Much of it relates to the way in which computers obtain and display time although there are a few other items.

Greenwich Mean Time (GMT) originally referred to mean solar time at the Royal Observatory at Greenwich. It is now often used to refer to Coordinated Universal Time (UTC).

British Summer Time (BST): Advance clocks one hour from 1.00 am gmt on the last Sunday in March until 1.00 am gmt on the last Sunday in October.

Network Time Protocol (NTP) is used by computers to keep their local clock in step with a time server. Playing with your time server settings will do no harm and it may improve the accuracy of your clock. You can use any time server but it is normally best to use one on your network or provided by your internet service provider. Time servers are sometimes removed because of overloading or attacks so it would be wise to ocasionally check that your time server is still functioning. There are lists of public time servers (often out of date) or you could try the server pool. The ideal might be a Stratum 1 server with negligable jitter and a ping of less than 20 ms - sorry but I am not going to tell you where it is! Firewalls often block NTP and ping signals but with a little investigation many users find a time server which they can use from both home and work. Try investigating eg ntp0.myEmployer.com and then progress to ntp1, ntp2 etc.

The GMT clock to the right should enable you to check the accuracy of your computer clock to within about a second. Try page refresh before you disable java animation. About the NIST time service.

Links

Informatics
Standard Date and Time
Sun rise and set times

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27 - 09 - 2012