If I have servers in multiple timezones then I would almost certainly
want a fixed timezone across them. GMT seems as good a choice as any. But
we could make it a user setting but I suspect that makes the issue harder
to handle.
Certainly the current situation is confusing users, I think we've had two
emails this month about it on the GeoServer list.
Ian
On 17:49, Sat, 18 Apr 2015 Andrea Aime <andrea.a...@geo-solutions.it> wrote:
> On Fri, Apr 10, 2015 at 2:08 PM, Ian Turton <ijtur...@gmail.com> wrote:
>
>> The issue is that given a Date in the JVM timezone we convert to a time
>> in milli seconds and call
>>
>> Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
>> cal.setTimeInMillis(time);
>> cal.set(Calendar.HOUR_OF_DAY, 0);
>> cal.set(Calendar.MINUTE, 0);
>> cal.set(Calendar.SECOND, 0);
>> cal.set(Calendar.MILLISECOND, 0);
>> return new java.sql.Date(cal.getTimeInMillis());
>>
>> So that cal is in GMT which we then truncate to midnight GMT and then
>> convert to an SQLDate in JVM timezone - moving the date a day earlier if we
>> are in GMT+X
>>
>> Thus people get back a date they didn't expect which leads to the wrong
>> answer as the test shows,
>>
>
> Yep, I can see that. My observation is, before we just jump the gun and
> state "everything has to be GMT because it has always been like that",
> that first it's not true, I've shown that in my previous mail, and second,
> is that the right behavior?
> Or should we try to keep the dates for as long as possible in whatever
> timezone they were when we read them, and decide on
> a conversion at the outskirts of the system, when we have some more
> knowledge of what the needs and limits of the target are?
>
> I would like to first have people discuss what the correct behavior is,
> and once we have an agreement, go for a fix.
>
> Cheers
> Andrea
>
> --
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> Ing. Andrea Aime
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