When Postgres stores a datetime in a
timestamp field, Postgres drops the UTC offset. This means
2019-10-11 21:11:24+02 and
2019-10-11 21:11:24-06 will both be stored as
2019-10-11 21:11:24 in the database, even though they are eight hours apart in time.
timestamptz field to ensure Postgres returns your timestamp with the correct UTC offset.