PostgreSQL: convert between date and epoch

1. Convert current time to epoch:

      SELECT extract(epoch FROM now());

      The following will give you the part before the decimal point.

      SELECT round(extract(epoch FROM now()));
      SELECT extract (epoch FROM current_date);

2. Convert a particular date to epoch:

      SELECT extract (epoch from timestamp '2016-02-28');

      SELECT extract (epoch from timestamp '2016-02-28 14:30:00');

3. Convert epoch to date:

      SELECT to_timestamp(1461888000);

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