Getting dates between startdate and enddate from array in swift - ios

Question

As I am new to swift, I stuck here from very longer,I am trying to get date from array between start date and end date,.
I have tried these code which refered from [https://stackoverflow.com/questions/10216991/fetching-dates-which-comes-between-startdate-and-enddate], But I am getting the error as "Value of type '[Date]' has no member 'filtered'".
In swift
var predicate = NSPredicate(format: "(SELF > %#) AND (SELF < %#)", startdate!, enddate!)
var result = arrayWithDates.filtered(using: predicate)
Expected output:
dateArray = ["12/01/1996","13/01/1996","15/01/1996","17/01/1996"]
startdate = "13/01/1996"
enddate = "17/01/1996"
output = ["13/01/1996","15/01/1996","17/01/1996"]
please help me to acheive this, thanks in advance

Answer 1

You can do it this way:
import Foundation
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd/MM/yyyy"
dateFormatter.timeZone = TimeZone(abbreviation: "GMT")
let dateArray = ["12/01/1996","13/01/1996","15/01/1996","17/01/1996"]
let startdate = dateFormatter.date(from: "13/01/1996")!
let enddate = dateFormatter.date(from: "17/01/1996")!
let output = dateArray
// Map your strings to Date objects excluding nils.
.compactMap { dateFormatter.date(from: $0) }
// Filter the mapped array by your condition.
.filter { $0 >= startdate && $0 <= enddate }

Answer 2

You can try below code, it works for me:
class ViewController: UIViewController {
var arrDates = NSArray()
var arrResultDates = NSMutableArray()
override func viewDidLoad() {
super.viewDidLoad()
arrDates = ["12/01/1996","13/01/1996","15/01/1996","17/01/1996"]
let strStartDate = "\(arrDates.firstObject!)"
let strEndDate = "\(arrDates.lastObject!)"
let formatter = DateFormatter()
formatter.dateFormat = "dd/MM/yyyy"
//Get start date
var startDate = formatter.date(from: strStartDate)
let endDate = formatter.date(from: strEndDate) // last date
// Formatter for printing the date, adjust it according to your needs:
let fmt = DateFormatter()
fmt.dateFormat = "dd/MM/yyyy"
let calendar = NSCalendar.current
while startDate! <= endDate! {
startDate = calendar.date(byAdding: .day, value: 1, to: startDate!)!
let strDate = fmt.string(from: startDate!)
if arrDates.contains(strDate)
{
arrResultDates.add(strDate)
}
}
print(arrResultDates)
}
Hope it will helps you :)

Answer 3

If you really need to use NSPredicate you have to bridge the array to NSArray which responds to filtered(using:
let predicate = NSPredicate(format: "(SELF > %#) AND (SELF < %#)", startdate!, enddate!)
let result = (arrayWithDates as NSArray).filtered(using: predicate)
However in the world of Swift this is not recommended. Just use the filter function with a closure
let result = arrayWithDates.filter { $0 >= startdate! && $0 <= enddate! }