Sets or gets the earliest date that an app user can select.
Setting minDate prevents app users from selecting
dates before the minimum date.
Set minDate to undefined to remove the current minimum date limitation.
Getting minDate returns the current minimum
date that an app user can select.
If a date is before the minimum date 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.