Doc: improve explanation of EXTRACT(EPOCH) for timestamp without tz.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 4a4cad91dab75ce25bbe4bf6b27a88b94a7eac45
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-01-01T20:51:09Z
Releases: 9.5.25
Doc: improve explanation of EXTRACT(EPOCH) for timestamp without tz.

Try to be clearer about what computation is actually happening here.

Per bug #16797 from Dana Burd.

Discussion: https://postgr.es/m/16797-f264b0b980b53b8b@postgresql.org

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doc/src/sgml/func.sgml modified +17 −7

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