Timezone using longitude

[Abdullah Kamran]

I have found a method to find the timezone using longitude of a place from somewhere. I tried it to do some calculations and found it working, it is not very accurate though (needs some improvements)

The timezone changes every 15 degrees on longitude either way. The formula to find timezone is:

(longitude/15) * 3600;

This will give you timezone (or time differnce from GMT) in seconds. And can be used in calculations.

Hope this will help.

Regards,

A Kamran

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[Michael A. Covington]

Re: Timezone using longitude

What you are calculating is local mean time, not zone time. Time zones are
established by law, usually follow 1-hour increments, and have boundaries
that are not straight lines.

For example, Atlanta (longitude 84 west) is 5.6 hours behind GMT according
to your formula, but in fact it is officially 5 hours in the winter and 4
hours in the summer.

Local mean time is almost always within 1 hour of official (standard) zone
time.



<Abdullah Kamranwrote in message news:2007951136 13akamrans@yaho o.com...

>I have found a method to find the timezone using longitude of a place from
>somewhere. I tried it to do some calculations and found it working, it is
>not very accurate though (needs some improvements)
>
The timezone changes every 15 degrees on longitude either way. The formula
to find timezone is:
>
(longitude/15) * 3600;
>
This will give you timezone (or time differnce from GMT) in seconds. And
can be used in calculations.
>
Hope this will help.
>
Regards,
>
A Kamran
>
EggHeadCafe - .NET Developer Portal of Choice
http://www.eggheadcafe.com