On Sat, Apr 18, 2015 at 8:01 PM, Andrea Aime <andrea.a...@geo-solutions.it>
wrote:
> in GMT before insterting them in the database, which is probably going to
> be used by other applications too?
> What if the other apps are not timezone savvy, or what if your database
> does not have a timestamp with timezone
> field?
>
Thinking a bit more about it, two examples:
* We are reading an already existing table in a database, the drivers gives
us a Date object. What timezone is it in?
The JVM default one
* When we are converting the Date objects in strings, using those
formatters that force the date in GMT, what is
the formatter doing? Taking a Date object, which has no timezone of its
own, assuming it's in the JVM timezone
(cannot really be otherwise), and then converting it to GMT.
I'm convinced that forcing GMT is the wrong way to go, the right assumption
is already in the JVM, java.*.Date
objects already supposed to be in the JVM default time zone.
The problem is in the date->string converters that are geared towards GML
usage, that force a GMT representation
of the dates.
And those are wrong too, because GML can represent dates in whatever time
zone, I believe they are setup
that way because the CITE tests are checking for dates in GMT.
Imho, if you are working in an application that spans timezones, large
area, eventually worldwide, you setup
your systems and JVM to run on GMT (like I normally see them in these
occasions) and naturally expect
all dates in that timezone.
If you are working in a local application instead, everything is running in
your local timezone,and everything,
including GML, should be in that timezone, and correctly reflect it,
instead of being coerced to GMT, e.g.:
<gml:beginPosition>2011-04-04T00:00:00-05:00</gml:beginPosition>
So... I believe we should remove all the bits that are forcing an innatural
time zone, and for the specific of the GeoServer CITE tests,
we should probably just document that the JVM must be set in GMT
Cheers
Andrea
--
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Ing. Andrea Aime
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