Sets or gets the latest date that a site visitor can select.
Setting the maxDate property prevents site visitors from selecting
dates past the maximum date.
Set maxDate to undefined to remove the
current maximum date limitation.
Getting the maxDate property returns the current maximum
date that a site visitor can select.
If a date is past the maximum date but is also set as an enabled date
with the enabledDateRanges property, the date is
disabled and the site visitor can't select the date in the date picker.