Just sharing what I'm doing...
It looks like getting the GMT offset and using that to create a time zone does
not give me an object that knows about daylight savings.
So I created a different approach which I've tested in Safari/Chrome/FireFox.
The JavaScript is like this:
<wo:hidden value="$clientTimeZoneID" id="clientTimeZoneID"/>
<script>
$('clientTimeZoneID').value = new
Date().toString().match(/\50\w+\51/)[0].match(/\w+/);
</script>
This JavaScript gets you the ID of the timezone that appears in parenthesis
when converting a Date object to a string. This returns something like "EST",
or "MST", or "PST", or "CST".
Then from Java I can create a time zone object using the ID:
TimeZone clientTimeZone = TimeZone.getTimeZone(clientTimeZoneID);
Using the ID is deprecated because CST could be confused with China Standard
Time (instead of Central Standard Time). But I guess that's okay for us
because our clients are all US-based. :-)
The TimeZone object created using this ID knows about daylight savings and
makes it useful for date/time input in the client time zone. And I can then
know exactly what the equivalent is in my app's time zone.
P.S. I still have to test in Internet Explorer.
On Nov 12, 2010, at 12:37 AM, Travis Britt wrote:
> Yeah I do this by using javascript get the GMT offset reported by the browser
> on login, and store that in the session. Then use the offset to create a
> java.util.TimeZone and use that in a formatter to display all your time
> stamps in the user's expected time zone.
>
> tb
>
> On Nov 11, 2010, at 2:30 PM, Ricardo J. Parada wrote:
>
>> Thanks... That should get me going.
>>
>>
>>
>> On Nov 11, 2010, at 4:43 PM, Johann Werner wrote:
>>
>>> Hi Ricardo,
>>>
>>> have a look at
>>> http://josephscott.org/archives/2009/08/detecting-client-side-time-zone-offset-via-javascript/
>>> So you could put the presented script snippet in your login form and
>>> extract the GMT offset of the client from the request form values.
>>>
>>> jw
>>>
>>> Am 11.11.2010 um 22:25 schrieb Ricardo J. Parada:
>>>
>>>>
>>>> What are you all doing to find out the timezone from the browser? I'm
>>>> guessing there is a header in the request containing this info.
>>>>
>>>> Thanks,
>>>> Ricardo
>>>
>>>
>>
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