Sets or gets the days of the week that an app user can't select.
Setting disabledDaysOfWeek prevents app users
from selecting the specified days of the week.
Set disabledDaysOfWeek to an empty array ([]) to remove the current
disabled days of the week.
Getting disabledDaysOfWeek returns the
current list of disabled days of the week.
disabledDaysOfWeek accepts an array of integers from 0 to
6, where 0 represents Sunday, 1 is Monday, 2 is Tuesday, and so on.
If a date falls on a disabled day of the week, but is also set as an enabled date
with enabledDateRanges, the date is
disabled and the app user can't select the date in the date picker.