日期不在开始日期和结束日期之内

Question

I have the following code which checks if a selectedDate is within a start and end date. I want to know how to go about saying while the date is NOT within the 2 dates however I don't know how to go about it. I tried using '!==' however it says 'Type of expression is ambiguous without more context'

while newStartDate.compare(selectedDate) == .OrderedAscending && newEndDate.compare(selectedDate) == .OrderedDescending {
     print("\(selectedDate) is within \(newStartDate) & \(newEndDate)")     
}

Answer 1

What about ?

while newStartDate.compare(selectedDate) == .OrderedDescending || newEndDate.compare(selectedDate) == .OrderedAscending {
   print("\(selectedDate) is within \(newStartDate) & \(newEndDate)")
}

The selected date has to be before the start date or after the enddate.

Answer 2

I think JulianM's Answer is right. In my opinion to make it more readable, you can use your first try with != :

while newStartDate.compare(selectedDate) != .OrderedAscending || newEndDate.compare(selectedDate) != .OrderedDescending {
    print("\(selectedDate) is within \(newStartDate) & \(newEndDate)")
}