Disabling days not belongs to a given month

[ernestop74]

can create a function that disable the days in the calendar that doesn't belong to a given month. For instance, when user open november, at the begining of the calender display some of the final days of octuber and at the end display the first days of december.
You could hide those days and just show empty gray little boxes or you just can show those days, but the user can't click on them