oracle systimestamp (sysdate) to milliseconds

Question

Could you provide implementation of stored function to get current systimestamp as milliseconds.
Something I can use like

select current_tim         


        

Answer 1

I've posted here some methods to convert timestamp to nanoseconds and nanoseconds to timestamp. These methods are not affected by time zones and have a nanosecond precision.

You just need to adjust it to get milliseconds instead of nanoseconds.

SELECT (EXTRACT(DAY FROM (
    SYSTIMESTAMP --Replace line with desired timestamp --Maximum value: TIMESTAMP '3871-04-29 10:39:59.999999999 UTC'
- TIMESTAMP '1970-01-01 00:00:00 UTC') * 24 * 60) * 60 + EXTRACT(SECOND FROM
    SYSTIMESTAMP --Replace line with desired timestamp
)) *  1000 AS MILLIS FROM DUAL;

MILLIS
1598434427263.027