The easiest thing to do to get this working how it used to is to disable JavaScript in the browser and then make sure that in the address bar you do not specify the day, month or year. So just have

.../day.php
or .../day.php&area=1

That is a very simple for you to do that would make it keep to the current day.

However I wonder if there is a requirement in cases like yours for new views, let's call them 'today', 'this_week' and 'this_month' that just show the current bookings but without all the navigation?