How do I lock time trackings?

As an Administrator you can find the option to lock tracking time in your administration menu.

The lock always refers to tracked times until a specific date. You can't lock tracking times seperately.

For example if you want to prevent deleting or creating new time records for an already invoiced period so just choose an appropriate option.

The option "Until the end of the week" for example means that only tracked times of the current week can be edited. Tracked times of the last week are automatically locked. If you still want to edit them, just set the option "no restriction" or "fix date".