For the daily dataset you can set the number of ‘expiry days’ to 30. This will only allow data to be entered for the last 30 days. There is not a way to only show the days in the last month. The day that are shown will always be relative to the current date.
For the monthly data set you can set the ‘open future periods for data entry’ to 1 and you can set the ‘Expiry days’ to 1. This will allow the user to enter data for the next month (the month after your current month) and prevent them from entering data for any previous months.
Hope this helps!