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ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS';
WITH test_data ( date_value ) AS ( SELECT DATE '1970-01-01' + INTERVAL '3' HOUR FROM DUAL ) SELECT date_value, ( CAST( FROM_TZ( CAST( date_value AS TIMESTAMP ), -- Cast to timestamp 'Europe/Berlin' -- Convert to expected TZ ) AT TIME ZONE 'UTC' -- Convert TZ to UTC AS DATE -- Cast back to DATE data type ) - DATE '1970-01-01' )*24*60*60 AS epoch_time FROM test_data
DATE_VALUE
EPOCH_TIME
1970-01-01 03:00:00
7200