CODEWITHSUNDEEP
iosswiftswift3
Dhruv
Dhruv

Reputation: 13

Date Format Error in swift

I am new to the swift library. I am using the calendar in swift and I want to show the events in calendar. The events are obtained from the Json API but when I compare the date it is showing an error.

This is the code 

  let data = event["date"] as? String
  let newString = data?.replacingOccurrences(of: "/", with: "-")
  self.FirstData = self.EventDates[0]

compare function 

 func compareDate(date : String){
        let date = date

        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
      ====>>>>Error in line 
  let dateFromString : NSDate = dateFormatter.date(from: date)! as NSDate 
        dateFormatter.dateFormat = "yyyy-MM-dd"
        let datenew = dateFormatter.string(from: dateFromString as Date)
        print("datee",datenew)

    }

Error: fatal error: unexpectedly found nil while unwrapping an Optional value

How to compare date or resolve this issue.

Upvotes: 0

Views: 3568

Answers (4)

MinuMaster
MinuMaster

Reputation: 1457

Your app is crashing because of date string was not in the same format which was assigned to dateformatter. Because of that date object return nil value.

And you force nil value to convert NSDate object. Because of that app is crashing.

You just need to change your compare date method as below:

func compareDate(date : String) -> Date? {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "MM-dd-yyyy"
    let dateFromString = dateFormatter.date(from: date)
    print("datee", dateFromString ?? "")
    return dateFromString
}

By doing this you can able to create the Date object.

Upvotes: 0

Tom E
Tom E

Reputation: 1607

date(from:) returns an optional Date simply because it may fail to properly convert the given string. As you cannot be sure when this happens you must not force unwrap the result (dateFormatter.date(from: date)!) but rather safely unwrap the optional, i. e. using this construct:

if let dateFromString: NSDate = dateFormatter.date(from: date) as NSDate {
    ...
}

Upvotes: 1

Pushpendra
Pushpendra

Reputation: 986

try this :- 

func convertDate(date:String) -> String {
     let dateFormatter = DateFormatter()
    let tempLocale = dateFormatter.locale // save locale temporarily
    dateFormatter.locale = Locale(identifier: "en_US_POSIX") 
   // date format getting from server 
     dateFormatter.dateFormat = "YYYY-MM-dd'T'HH:mm:ss.SSSSSS'Z'"

    let date = dateFormatter.date(from: date)!
    //date format you want
    dateFormatter.dateFormat = "yyyy-MM-dd"
    dateFormatter.locale = tempLocale // reset the locale
    let dateString = dateFormatter.string(from: date)
    print("EXACT_DATE : \(dateString)")
    return dateString
 }

Upvotes: 2

Vikas Rajput
Vikas Rajput

Reputation: 1874

try this to change date format

 let dateFormatter = NSDateFormatter()
 dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
 dateFormatter.timeZone = NSTimeZone(name: "GMT")
 let date = dateFormatter.dateFromString("2012-12-06 T 06:00:00 ")

 dateFormatter.dateFormat = "yyyy-MM-dd"
 let goodDate = dateFormatter.stringFromDate(date!)

Upvotes: 0

Related Questions