Why updating time is so important for a web server like nginx?

Question

As you can see,every time a signal is received,nginx will first of all update time,why is time a big deal for web servers?

Answer 1

nginx uses the time for rate limiting, among other things (like logging).

Implementing good rate limiting is probably the main reason to keep the value as up-to-date as possible, though.

Answer 2

In the event-driven programming, timer is an important thing which used to process timeout event etc.

So nginx must update time at first to keep timer working correctly.