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Date: Wed, 12 Feb 2014 09:16:04 -0800
From: Adrian Klaver <adrian.klaver@gmail.com>
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To: rawi <only4com@web.de>, pgsql-sql@postgresql.org
Subject: Re: Re: Time AT TIME ZONE: false result using offset instead
 of time zone name
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On 02/12/2014 07:29 AM, rawi wrote:
> Adrian Klaver-3 wrote
>> Welcome to the wacky world of time, it is all relative:) The choices are
>> handle everything as UTC until you present to the end user or use actual
>> timezones, for example, America/Los_Angeles. To illustrate, in your
>> original post you said:
>>
>> "But it would be easier to ask a specific time offset (got from a client
>> around the world), so for me +01 hour"
>>
>> Do you know if that offset supplied by the client was POSIX or ISO in
>> its sign?
>
> The (playing) question was: how would I get the time zone of a browser
> somewhere unknown on earth?
>
> And the found javascript solution would return the difference between GMT
> and localtime in minutes, so for me west from Greenwich a negative integer.
>
> Please save the following in a html file eg. "time_offset.html" and load it
> in your browser:


I am on the US Pacific Coast so my current timezone is PST, UTC-8 ISO

So using javascript in my browser:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/getTimezoneOffset


var offset = new Date().getTimezoneOffset();

offset = 480

480 minutes/60 minutes = 8 hours

Which tracks with the above link:

"The time-zone offset is the difference, in minutes, between UTC and 
local time. Note that this means that the offset is positive if the 
local timezone is behind UTC and negative if it is ahead."

and also the POSIX offset. You just have to remember to invert sign for 
your local timezone when doing the AT TIMEZONE if you use the POSIX method.

Of course you are counting on the client having their environment set up 
correctly.


>
>
>
>
>


-- 
Adrian Klaver
adrian.klaver@gmail.com


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