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select timestamp '2018-10-19 09:12:47.0 AMERICA/DENVER' - timestamp '1970-01-01 00:00:00.0 UTC' as diff from dual;
DIFF
+000017823 15:12:47.000000000
select extract(day from diff) * 86400000 + extract(hour from diff) * 3600000 + extract(minute from diff) * 60000 + extract(second from diff) * 1000 as unixtime from ( select timestamp '2018-10-19 09:12:47.0 AMERICA/DENVER' - timestamp '1970-01-01 00:00:00.0 UTC' as diff from dual );
UNIXTIME
1539961967000