Hello @Fa0,
Do you have a minimum number of days' notice for bookings? If yes then this is why the calendar can have a stopwatch.
The minumim number of days' notice can be set by going to your calendar and clicking on "Availability settings" then selecting "Reservation preferences". On that page wou will see a box called "Advance notice".
I have it set to "At least 2 day's notice". So, for example, if I have no booking for tomorrow my calendar will show a stopwatch for tomorrow. This is to show me that no booking can be made for tomorrow as I require 2 days' notice for bookings.
Steve