Difference between two NSDates in Months and Years in Swift iOS

Question

I have to calculate the time between two NSDates in Month + Year.

Example 1:

Start Date: September 2018
End Date: May 2019 

So I have to get the difference between these two dates and have to display only last 6 months like below:

April 2019
March 2019
February 2019
January 2019
December 2018
November 2018

Example 2:

Start Date: October 2019
End Date: December 2019 

Output should be:

November 2019
October 2019

I can able to to get the difference between two dates in months using below code:

let components = Calendar.current.dateComponents([.weekOfYear, .month], from: subscriptionDate!, to: currentDate!)

Can anyone please help me on this?

Thank you!

Answer 1

You can do this in following way...

//set start & end date in correct format
let strStartDate = "September 2019"
let strEndDate = "December 2019"

//create date formatter
let formatter = DateFormatter()
formatter.dateFormat = "MMMM yyyy"

//convert string into date object
guard let startDate = formatter.date(from: strStartDate) else {
  print("invalid start date")
   return
}

 //convert string into date object
guard let endDate = formatter.date(from: strEndDate) else {
  print("invalid end date time")
  return
}

//calculate the month from end date and that should not exceed the start date
for month in 1...6 {

  if let dt = Calendar.current.date(byAdding: .month, value: -month, to: endDate) {
     if dt.compare(startDate) == .orderedAscending {
        break
      } 
      print(formatter.string(from: dt!))
  }
}