How to mock javascipt new Date to return different date from browser console

Question

There is a website I use which shows different content on different dates. In the JavaScript, it uses new Date() to determine the current date, which it uses to determine which content to show.

If I would like to view content from a different date, I can change my system time. However, this is tedious and interferes with other applications. I am trying to figure out if there is some code I can run in the browser's javascipt console that will mock out new Date() to return the date of my choosing

I see there are some questions that discuss creating a spy on Date with jest, but I do not see a way to mock this in my browser console

Answer 1

You can use this to modify the content before it is loaded: https://developer.chrome.com/docs/extensions/reference/webRequest/

There is this extension which I haven't used that may be able to do it: https://chrome.google.com/webstore/detail/page-manipulator/mdhellggnoabbnnchkeniomkpghbekko?hl=en