sql - Get timestamp from date & time in UTC -

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i have table have date , time timezone.

date_time_table +------------+--------------+ |   date_t   |   time_tz    | +------------+--------------+ | 2016-05-13 | 23:00:00 -02 | | 2016-05-14 | 13:00:00 +06 | +------------+--------------+

after run sql query 'utc' time

select timetz @ time zone 'utc' date_time_tz

the result is:

+--------------+ |   time_tz    | +--------------+ | 01:00:00 +00 | | 07:00:00 +00 | +--------------+

can write sql combined date_t time_tz calculate date too?

the result expect is:

+------------+------------+ |      date_time_tz       | +------------+------------+ | 2016-05-14 01:00:00 +00 | | 2016-05-14 07:00:00 +00 | +------------+------------+

i try :

select concat(date_t , ' ' ,time_tz) @ time zone 'utc' date_time_table

but not work.

select concat(date_t , ' ' ,time_tz)::timestamp @ time zone 'utc' date_time_table

try casting this


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