[hibernate-dev] Date/Time Support and timezones

[Sanne Grinovero]

Forcing 3 is correct but rarely desirable, I'm afraid the user should choose.

But most people will not like the additional
space/performance/complexity hit, and will use a single timezone.

If you think we should force people into a correct choice, you'd
require 3# unless they are willing to set a global timezone
configuration property, or maybe even a per-property timezone on the
mapping, in which case you'd go for 2(4) but having them choose the
poison.

On 24 March 2015 at 12:30, Gunnar Morling <gunnar at hibernate.org> wrote:
> 3) seems most desirable to me, too.
>
> What type would your "TZ" column have? Just a numeric offset? Or a VARCHAR,
> also capable of storing textual TZ representations such as "+01:00
> Europe/Paris"? I think the latter would be needed to make it fully
> reflexive for ZonedDateTime.
>
> Another variant of 3) could be to leverage DB-specific types such as
> TIMESTAMP WITH TIME ZONE on Oracle. I could imagine that'd be what users of
> databases supporting such a type might want.
>
> --Gunnar
>
>
> 2015-03-24 3:00 GMT+01:00 Steve Ebersole <steve at hibernate.org>:
>
>> Not in the same Type.  But of course "Type swapping" is so easy nowadays...
>>
>> On Mon, Mar 23, 2015 at 4:01 PM, Hardy Ferentschik <hardy at hibernate.org>
>> wrote:
>>
>> > > A few options:
>> > >
>> > > 1) Forego OffsetDateTime, OffsetTime and ZonedDateTime support and just
>> > > stick with LocalDateTime, LocalDate and LocalTime.
>> > > 2) Use the timezone/offset to pass along to the driver (for proper
>> > > conversion); when reading back we'd have to read back based on the
>> > default
>> > > timezone.  This is essentially the old strategy used in CalendarType
>> > which
>> > > I never really liked because its not reflexive.
>> > > 3) Break them into a tuple of the store each piece.  E.g., for
>> > > OffsetDateTime the Tuple is a LocalDateTime (the Timestamp) and a TZ
>> > > offset.  So we'd store each individually in the database and be able to
>> > > rebuild them in a fully reflexive manner.
>> > > 4) Handle them using UTC or GMT at the JDBC level.  This is essentially
>> > the
>> > > same as (2)
>> >
>> > Personally, I think I'd prefer #3. I am not sure whether all users would
>> > be happy
>> > with two columns for a OffsetDateTime. Could we support multiple options,
>> > for example
>> > #3 and #4 and make it configurable?
>> >
>> > --Hardy
>> >
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