Get the current unix timestamp in oracle

The following expression returns the Unix time in milliseconds independent of the time zone.

It sums the number of days passed from the start of the Unix epoch multiplied by the number of milliseconds in a day (24 * 60 * 60 * 1000 = 86400000) plus number of milliseconds past midnight (SSSSS with a precision of 3 FF3 to express milliseconds).

It uses the SYS_EXTRACT_UTC method to extract the UTC (Coordinated Universal Time—formerly Greenwich Mean Time) from the current timestamp (systimestamp in oracle):

SELECT
     EXTRACT(DAY FROM(sys_extract_utc(systimestamp) - to_timestamp('1970-01-01', 'YYYY-MM-DD'))) * 86400000
    + to_number(TO_CHAR(sys_extract_utc(systimestamp), 'SSSSSFF3'))
  FROM dual;

Reference -
https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/SYS_EXTRACT_UTC.html

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