Lock timesheets
Users with admin permissions can set auto-locking of timesheets in Runn in settings.
After the selected number of weeks, Editors, Viewers, and Timesheet Only users will not be able to edit timesheets.
Those with admin permissions can always edit them.
Example
If you select timesheets to auto-lock after 1 week, users can only edit timesheets for the current week.
If you select 2 weeks, users can edit this week's and last week's timesheets.
You can set this up in Settings > Account Settings
Disable Timesheet Locking
Enter 52 weeks in the field so the timesheet will only be locked after 52 weeks.