[Hidden-tech] GMT time zone calculations

Elijah Gwynn eli at egwynn.com
Tue Dec 6 18:05:15 EST 2016

GMT (Greenwich Mean Time) is the timezone of Greenwich, England. It’s 
also known as UTC (which stands for “Coordinated Universal Time” in 
English and “Temps Universel Coordonné” in French… yeah…). In a 
lot of ways, it’s the “middle” of the world’s timezones.

We are currently EST (Eastern Standard Time), which is GMT-5 (which you 
can pronounce as “GMT minus five”).

During the warmer months, we are EDT (Eastern Daylight Time), which is 

GMT+8 is 13 hours ahead of us (we’re 5 hours behind GMT, and they’re 
8 hours ahead of it, so 13). So they’ll be in “tomorrow” after 
11am EST (24:00 - 13:00 = 11:00), or 4pm GMT (24:00 - 8:00 = 16:00).

You can see a map of the world’s timezones at 
http://www.timeanddate.com/time/map/. Things might make a little more 
sense after you stare at that for a while. But if you stare at it too 
long, it might start making less sense again!

Hope this helps!


On 6 Dec 2016, at 16:53, Marcia Yudkin wrote:

> Hi everyone,
> I've been asked to suggest a time for a meeting with folks who are in 
> time zone GMT +8.  I think they are in China, Taiwan or Singapore, but 
> I'm not sure.
> This GMT system confuses me.  What GMT time zone are we in, in the 
> Northeast?
> How do I express a certain time in GMT terms, as opposed to Eastern 
> time?
> And then there's the international date line to consider as well!  If 
> they are in Asia, then they are a day "ahead" of us, correct?
> Help!
> Marcia Yudkin
> Goshen
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