Getting the difference in two dates - Swift - ios

Question

I cannot get the date difference function to work. It says NSDate is not implicitly convertible to 'Date' but I do not see an immediate work around this; using as Date does not work.
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var dateLabelOutlet: UILabel!
let currentDate = NSDate()
let dateFormatter = DateFormatter()
let userCalendar = NSCalendar.current
let requestedComponent: NSCalendar.Unit = [
NSCalendar.Unit.month,
NSCalendar.Unit.day,
NSCalendar.Unit.hour,
NSCalendar.Unit.minute,
NSCalendar.Unit.second,
]
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
func printTime(){
dateFormatter.dateFormat = "dd/MM/yy hh:mm:ss a"
let startTime = NSDate()
let endTime = dateFormatter.date(from: "25/12/16 00:00:00")
let timeDifference = userCalendar.components(requestedComponent, from: startTime, to: endTime!, options: [])
dateLabelOutlet.text = "\(timeDifference.month) Months \(timeDifference.day) Days \(timeDifference.minute) Minutes \(timeDifference.second) Seconds"
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

Change all of your NSDate to Date, then replace your requestedComponent with this:
let requestedComponent: Set<Calendar.Component> = [ .month, .day, .hour, .minute, .second]
Your difference will be:
let timeDifference = userCalendar.dateComponents(requestedComponent, from: startTime, to: endTime!)
FYI: Your dateFormatter doesn't work with this "25/12/16 00:00:00"
here is your whole class in correct form:
class ViewController: UIViewController {
#IBOutlet weak var dateLabelOutlet: UILabel!
let currentDate = Date()
let dateFormatter = DateFormatter()
let userCalendar = Calendar.current
let requestedComponent: Set<Calendar.Component> = [.month,.day,.hour,.minute,.second]
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
func printTime() {
dateFormatter.dateFormat = "dd/MM/yy hh:mm:ss"
let startTime = Date()
let endTime = dateFormatter.date(from: "25/12/16 00:00:00")
let timeDifference = userCalendar.dateComponents(requestedComponent, from: startTime, to: endTime!)
dateLabelOutlet.text = "\(timeDifference.month) Months \(timeDifference.day) Days \(timeDifference.minute) Minutes \(timeDifference.second) Seconds"
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 2

I think it will be helpfull.It will print all months between from and two dates
let dateFormtter = DateFormatter()
dateFormtter.dateFormat = "yyyy-MM-dd"
let startDate = dateFormtter.date(from: fromTF.text!)
let endDate = dateFormtter.date(from: toTF.text!)
func getMonthAndYearBetween(from start: String, to end: String) - >
[String] {
let format = DateFormatter()
format.dateFormat = "yyyy-MM-dd"
guard let startDate = format.date(from: start),
let endDate = format.date(from: end) else {
return []
}
let calendar = Calendar(identifier: .gregorian)
let components = calendar.dateComponents(Set([.month,.day]),
from: startDate, to: endDate)
var allDates: [String] = []
let dateRangeFormatter = DateFormatter()
dateRangeFormatter.dateFormat = "yyyy-MM-dd"
for i in 0 ... components.month! {
guard let date = calendar.date(byAdding: .month , value: i, to: startDate) else {
continue
}
let formattedDate = dateRangeFormatter.string(from: date)
allDates += [formattedDate]
print(allDates)
}
return allDates
}
Call above method like this
print(getMonthAndYearBetween(from: fromTF.text!, to:
toTF.text!))