How to convert DateTime to a number in MySQL?

Question

How can I get the total number of seconds since \'1970-01-01 00:00:01\' from a DateTime instance in MySQL?

Answer 1

UNIX_TIMESTAMP(datetime) force a localization of the datetime, which unlike the timestamp, is stored "as is".

You need actually any of the following, for discarding the UTC correction:

UNIX_TIMESTAMP(CONVERT_TZ(datetime, '+00:00', @@session.time_zone))

or:

TIMESTAMPDIFF(SECOND,'1970-01-01 00:00:00',datetime)

Refs: 1, 2, 3, 4