How can I get most recent time in a Postgres transaction

All we need is an easy explanation of the problem, so here it is.

I noticed that Postgres caches the value of NOW() inside a transaction, e.g.:

lev=# BEGIN;
BEGIN
lev=# SELECT now();
              now
-------------------------------
 2022-04-07 19:16:52.358923-07
(1 row)

lev=# SELECTpg_sleep(1);
 pg_sleep
----------

(1 row)

lev=# SELECT now();
              now
-------------------------------
 2022-04-07 19:16:52.358923-07
(1 row)

Is there a way to get up-to-date time inside a transaction for every call to NOW()?

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

As documented in the manual, now() (and the standard compliant current_timestamp) returns the time at the start of the transaction (and is an alias for transaction_timestamp())

If you want something that is independent of the statement or transaction start, use clock_timestamp()

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

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