In Weekly timesheet the date field is restricted to the last 12 months (currently first week available is 19/01/20 to 25/01/20. Can we go back further to 01/01/20?

Good to see you here, @danlakey. I'm here to answer your concerns. 

Yes, you should be able to set the date. However, if you're unable to set it, We can perform a few browser troubleshooting steps to verify if the issue you're currently experiencing is caused by stored cache files.

 Here's how:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Safari: Command + Option + P

If that works. you can go back to the main browser to clear the cache so the system will refresh. If you get the same result while using a private browser, I recommend different browser.

Feel free to check out this article for more details on creating timesheets.

Keep me posted on how this works. Take care and have a great day!