In the current global settings for the time allocation, there is no way to clone the date, which makes it very tedious to work with the time. Please check calendar for more information. This is one thing that is a must to fix. I guess there should be other options like the booking should be done one day prior. These are very common settings. The schedule can only be revealed for two weeks, three weeks, for a certain time period. They can reschedule, let's say, in two to three hours or something like this. These are the options mandatory.