Bug 22453: Make TestBuilder generates dates taking into account the timezone

Bug 22453: Make TestBuilder generates dates taking into account the timezone

I have no idea why this only appears today but TestBuilder generates dates using DateTime->now,
which does not take into account the timezone.

It has been highlights by a failing test today on U18.
Why today whereas this patch was pushed few weeks ago?
Why U18 and not D9?

The output of the test is:
koha_1       |     #   Failed test 'With BorrowerLogs and TrackLastPatronActivity we should not spam the logs'
koha_1       |     #   at t/db_dependent/Koha/Patrons.t line 1421.
koha_1       |     #          got: '2'
koha_1       |     #     expected: '1'
koha_1       |     # Looks like you failed 1 test of 4.
koha_1       |
koha_1       | #   Failed test 'BorrowersLog tests'
koha_1       | #   at t/db_dependent/Koha/Patrons.t line 1422.
koha_1       | # Looks like you failed 1 test of 33.
koha_1       | [19:51:44] t/db_dependent/Koha/Patrons.t

Actually there are 2 logs, one for the cardnumber that is expected, and on for updated_on:
   "updated_on" : {
      "after" : "2019-03-04 21:10:00",
      "before" : "2019-03-04 18:10:00"
   }
Apart from the fact that we may want to remove this updated_on field from MODIFY,
the before/after dates differ from 3 hours.
Here it's currently 18:10 and in UTC-3

To prevent such behaviors in tests (create stuffs in the future...), we should
use our Koha::DateUtils::dt_from_string method that takes care of the timezone
used in other places of Koha.

Test plan:
prove t/db_dependent/Koha/Patrons.t
May fail without this patch.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
This patch is fine in itself, but there may still be an issue around
the failing test for TrackLastPatronActivity. Reopened bug 22741.

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>