UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36

Steps to reproduce the problem:
Suggestion - N/A

What is the expected behavior?
Currently, the only simple ways to simulate this would affect other pages or the entire system date/time.

Similar to the "Network Conditions" tab, a new tab with the ability to select date and time related functions (e.g. date, time, timezone) could be added.

This could also open the potential to simulate the passage of time at slowed or advanced speeds, giving developers the ability to see how their pages behave in what the page perceives as "real time" over a longer period of time.

What went wrong?
It's difficult and not reliable to change time or date to see how a page will react. There is no ability to slow or speed the passage of time.

Did this work before? N/A 

Chrome version: 63.0.3239.84  Channel: n/a
OS Version: OS X 10.13.1
Flash Version: 

Example scenario where this would be handy: I expect a page will be left open on a user's browser for multiple days, showing different content. As a developer, I would like to speed time up and see how the browser handles the time differences quicker.

Traditionally, options here are limited as changing the system time won't update the contents of the page to reflect that a day or more has passed.

There are obviously a lot of repercussions throughout dev tools if this feature were to be implemented, but I couldn't find any discussion that would rule it out of the realm of possibility.

Thanks for your time!