postgres timestamp to datetime
to_timestamp(field_name)::timestamppostgres timestamp to datetime
to_timestamp(field_name)::timestampunix timestamp postgres
select now(),
extract(epoch from now()), -- correct
extract(epoch from now() at time zone 'utc'), -- incorrect
extract(epoch from now() at time zone 'utc' at time zone 'utc'); -- correct
now | date_part | date_part | date_part
-------------------------------+------------------+------------------+------------------
2014-10-14 10:19:23.726908+02 | 1413274763.72691 | 1413267563.72691 | 1413274763.72691
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