I realise that "this page is resource hungry for the server to construct and contains some elements that are not relevant on past dates" but we absolutely NEED the New Control Panel (NCP) calendar view to be able to display details of a guest that is still on our premises (if a phone call comes through, to see if they have any special medical needs, to see if they still owe us any money, to see if we have agreed a late check out, to call them a shuttle, etc, etc). The way things are at the moment, all details of them disappear at the pumpkin hour of midnight on the evening before the morning they're due to check out from us. (You also seem to have changed the dates that display when we change the room they're on. Previously there was a local timestamp on the auto message - now it's stamped (I presume) with the European server time). My suggestion would be to use GMT for all times, except where the administrator has set a local offset. Incidentally, where exactly do you set the local time offset in the NCP, please?
Could we compromise and change the button to show ONE left facing chevron and display bookings going back just one week (so as not to overload your servers). If not, then 3 days?
It really is unusable otherwise.