RE: Usability poll: Picking timezones

Subject: RE: Usability poll: Picking timezones
From: Fred Ridder <docudoc -at- hotmail -dot- com>
To: <daviddowning -at- users -dot- com>, <techwr-l -at- lists -dot- techwr-l -dot- com>
Date: Tue, 25 Nov 2008 17:09:57 -0500



David Downing wrote:

> Sounds like your MATH was fine. You added 1 to -8 and got -7. It sounds
> like it was more a matter of misunderstanding what the numbers
> signified. The negative numbers indicate a time to one side of GMT and
> the positive numbers indicate a time to the other side of GMT, so that
> in this case you had to ADD 1 to 8 to get 9 hours later.

Sorry but your analysis is simply wrong. When you are comparing two
time zones you are concerned with the difference between them, so
the correct operation is *subtraction*, not addition. The time difference
between UCT+8 and UCT+9 is 1 hour, not 17. The difference between
UCT+1 and UCT-8 is either 1-(-8) = 9 or (-8)-1 = (-9), depending on your
point of reference. By ignoring the negative sign and adding, you
actually performed the correct operation, but for an erroneous reason.

-Fred Ridder

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RE: Usability poll: Picking timezones: From: Downing, David

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