What kind of datestyle can this be?

Question

I have a table with a column defined as:

"timestamp" int8 NULL,

which stores values like '1638462043745210034' When I try to cast it to timestamp or timestamp with time-zone

SELECT '1638462043745210034'::timestamp at time zone 'UTC' ;

it returns an error:

date/time field value out of range: "1638462043745210034" Hint: Perhaps you need a different "datestyle" setting.

What kind of datestyle can it be and how can it be converted to a normal timestamp?

Answer 1

Looks like nanoseconds since the epoch:

SELECT to_timestamp(1638462043745210034 / 1000000000.0);

         to_timestamp         
══════════════════════════════
 2021-12-02 17:20:43.74521+01
(1 row)