Не совсем. В литералах есть значения часового пояса, которые следует проанализировать. Для сравнения:
select
to_timestamp('2018-12-25T06:00:00+01:00', 'YYYY-MM-DD HH24:MI:SS') as "seems ok",
to_timestamp('2018-12-25T07:00:00+02:00', 'YYYY-MM-DD HH24:MI:SS') as "but this is wrong!",
to_timestamp('2018-12-25T06:00:00+01:00', 'YYYY-MM-DD HH24:MI:SS+TZH:TZM') as "ok",
to_timestamp('2018-12-25T07:00:00+02:00', 'YYYY-MM-DD HH24:MI:SS+TZH:TZM') as "ok too"
seems ok | but this is wrong! | ok | ok too
------------------------+------------------------+------------------------+------------------------
2018-12-25 06:00:00+01 | 2018-12-25 07:00:00+01 | 2018-12-25 06:00:00+01 | 2018-12-25 06:00:00+01
(1 row)