How to generate correct timestamp?

Question

PHP

There is a timestamp:
1590598380386

I'm trying to generate like this:
round((microtime(true) * 1000) - (60*60*3/1000)
I get:
1590599116227

But this is not correct, and as a result, the request does not pass.

Answer 1

What do you want to do?
round((microtime(true) * 1000) - these are milliseconds
60*60*3/1000 - and this? Do you want to take away 10 milliseconds?

Answer 2

time()