How can i compare two dates (NSDate) in Swift 3 and get the days between them?

Question

How can I compare two dates in Swift 3? I found many solutions for other Swift versions, but they doesn't work for me.

let clickedDay:String = currentcell.DayLabel.text!
    let currentDate = NSDate()
    let currentDay = "" //want the current day
    let dateFormatter = DateFormatter()        
    var dateAsString = ""        
    if Int(clickedDay)! < 10 {            
        dateAsString = "0" + clickedDay + "-11-2016 GMT"
    }
    else {            
        dateAsString = clickedDay + "-11-2016 GMT"
    }

    dateFormatter.dateFormat = "dd-MM-yyyy zzz"
    let clickedDate = dateFormatter.date(from: dateAsString)        
    if currentDate as Date >= clickedDate! as Date {

        return true
    }
    else {
        //Want to get the days between the currentDate and clickedDate
        let daysLeft = ""
    }

I compare the tow dates, but i want the days which are between that tow dates. Can someone help me pls? Thanks and greets

Added: If I have the date 22.11.2016 and the currentdate (now 18.11.2016) i want the days between that (in this case 4)

Solution 1

Simply make extension of Date like this and get difference in days.

extension Date {
    func daysBetweenDate(toDate: Date) -> Int {
        let components = Calendar.current.dateComponents([.day], from: self, to: toDate)
        return components.day ?? 0
    }
}

Now use this extension like this

let numOfDays = fromDate.daysBetweenDate(toDate: toDate)

You can use DateFormatter to convert String to Date like this.

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd-MM-yyyy"
dateFormatter.timeZone = TimeZone(abbreviation: "GMT")
let date = dateFormatter.date(from: "18-11-2016")

Solution 2

Try This One

let startDateComparisionResult:ComparisonResult = currentDate.compare(clickedDate! as NSDate)

if startDateComparisionResult == ComparisonResult.orderedAscending
{
    // Current date is smaller than end date.
}
else if startDateComparisionResult == ComparisonResult.orderedDescending
{
    // Current date is greater than end date.
}
else if startDateComparisionResult == ComparisonResult.orderedSame
{
    // Current date and end date are same
}

Solution 3

Try:

let days=Calendar.current.dateComponents([.day], from: date_1, to: date_2)
let nb_days=days.day

Solution 4

Use this function to get all intermediate dates between two dates, just check if down date (final date) is greater than up date (first date) then order is +1, else order -1 :-

func selectDates(from upDate : Date, to downDate : Date, order : Int){
        var selectDate = Calendar.current.date(byAdding: .day, value: order, to: upDate)!
        while compareDate(dateInitial: selectDate, dateFinal: downDate) != true{
            print(" intermediate date is \(selectDate)")
            selectDate = Calendar.current.date(byAdding: .day, value: order, to: selectDate)!
        }
        print("*** intermediate dates are selected ***")

    }


func compareDate(dateInitial:Date, dateFinal:Date) -> Bool {
        let order = Calendar.current.compare(dateInitial, to: dateFinal, toGranularity: .day)
        switch order {
        case .orderedSame:
            return true
        default:
            return false
        }
    }

View more solutions

Comments

[moxmlb]

I want the days, how long it is to the next date

[moxmlb]

I want the days, how long it is to the next date

[Sapana Ranipa]

Depends on your currentDate and clickedDate value

[Marie Dm]

I'm not sure I understand you well. My answer gives you the number of days between your_date and Date() (so today). But if you want to compare with another date just change Date() with next_date.

[moxmlb]

Yes thats what i want. but in days I have no number, how get I the number?

[moxmlb]

Where i declaire the extension?

[moxmlb]

Get this error: use of unresolved identifier 'fromDate'

[moxmlb]

That works, but if i have the 18.11.2016 (fromdate) and 22.11.2016 (todate), it says 3 days

[moxmlb]

How i give them the right timezone? like this: dateAsString = clickedDay + "-11-2016 GMT" ??

[Nirav D]

@Mbach Check the edited answer to convert string to date, there is no need to add "GMT" with your dateString.

[Nirav D]

@Mbach I'm talking about this "0" + clickedDay + "-11-2016 GMT"

[Nirav D]

@Mbach Welcome :)

[Marie Dm]

Sorry I forgot the second part :) I updated my answer @Mbach