The dates are saved on UTC times on the database. So, for example,
if living in West Australia, `Date.current.beginning_of_day` will be
stored as UTC's yesterday at 15:15:00, while `Date.current.end_of_day`
will be stored as UTC's today at 15:14:59.
When we use the `DATE` database function, PostgreSQL will select the
records with the same UTC date as the current UTC date. However, we need
the records with the same application date (as defined in
`config.time_zone`) as the current application date. The test passed
(for us) because we were using `beginning_of_day + 3.hours` to make sure
we were creating records when the date in Madrid was the same as the UTC
date.
Using a ruby interval for the time condition solves the problem.
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