Convert string to DATE type in swift 3

Question

I have this structure:

struct message {

  var id: String = "0"
  var text: String = ""
  var date: Date!
  var status: String = "" 
}

I have to load this structure from dbase, that it export in String format also date. So I write this code to convert String to Date type:

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
dateFormatter.timeZone = NSTimeZone(abbreviation: "UTC") as TimeZone!
let dataDate = dateFormatter.date(from: elemMessage["date"] as! String)!

And I load it in structure:

message(id: elemMessage["id"] as! String, text: elemMessage["text"] as! String, date: dataDate as! Date, status: elemMessage["status"] as! String)

But I have this warning: "Cast from Date to unrelated type Date always fails"

So if I run app it will fails.

How Can I fix this, the date var in structure have to be Date type.

Thank you.

Solution 1

You can convert String Date into Date/NSDate like below code: -

Swift 3.2 & Swift 4.2

String to Date

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd-MM-yyyy" //Your date format
dateFormatter.timeZone = TimeZone(abbreviation: "GMT+0:00") //Current time zone
//according to date format your date string
guard let date = dateFormatter.date(from: "01-01-2017") else {
    fatalError()
}
print(date) //Convert String to Date

---

Date to String

dateFormatter.dateFormat = "MMM d, yyyy" //Your New Date format as per requirement change it own
let newDate = dateFormatter.string(from: date) //pass Date here
print(newDate) //New formatted Date string

---

Output: -

2017-01-11 00:07:00 +0000
Jan 11, 2017

Solution 2

Swift 4 ISO

let dateFormatter = DateFormatter()
    dateFormatter.locale = Locale(identifier: "en_US_POSIX")
    dateFormatter.timeZone = TimeZone.autoupdatingCurrent
    dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"

Solution 3

 func getDateFromString(dateStr: String) -> (date: Date?,conversion: Bool)
{
    let calendar = Calendar(identifier: Calendar.Identifier.gregorian)
    let dateComponentArray = dateStr.components(separatedBy: "/")

    if dateComponentArray.count == 3 {
        var components = DateComponents()
        components.year = Int(dateComponentArray[2])
        components.month = Int(dateComponentArray[1])
        components.day = Int(dateComponentArray[0])
        components.timeZone = TimeZone(abbreviation: "GMT+0:00")
        guard let date = calendar.date(from: components) else {
            return (nil , false)
        }

        return (date,true)
    } else {
        return (nil,false)
    }

}

//Input: "23/02/2017"

//Output: (2017-02-23 18:30:00 +0000, true)

Comments

[Paolo Gdf]

I have used your code but i have error: ` Cannot convert value of type 'Date?' to expected argument type 'Date!' ` when load it in structure message.

[Fattie]

NOTE HOWEVER you have to cache date formatters in iOS: stackoverflow.com/a/42370648/294884

[Vineesh TP]

@Andand Nimje : Have you noticed that, one day decremented after the convertion

[Anand Nimje]

Let me check @VineeshTP

[Anand Nimje]

Thank you so much @VineeshTP for your suggestion.

[mask8]

shouldn't mm be upper case?

[Pulkit Kumar Singh]

not working ....date are coming incorrect after converting to date

[Anand Nimje]

@PulkitKumarSingh what problem are you facing can you tell me in details so i can help you. I think are you doing something wrong.

[Pulkit Kumar Singh]

date , month , year was coming incorrect ...time was right ....my date was in format "20-02-2018 06:20" ...i copied your code and then ran it. It was giving current date.

[Anand Nimje]

if you trying to convert String to Date then code working fine. @PulkitKumarSingh I can show you Playground screenshot. I think still you not able to understand code.

[Pulkit Kumar Singh]

Please run your code ......I am still not able to convert string to date.....date is coming incorrect...ran again!!

[GilroyKilroy]

If you look closely at the output screen you see you converted July 11, 2017 but actually got January 11, 2017. You want the date format string to be "dd-MM-yyyy"

[Mark Gerrior]

mm is minute. MM is month. Single M or double M works. Date Formaters > Date Format Patterns

[oscar castellon]

change "dd-MM-yyyy" instead "dd-mm-yyyy"

[nitin.agam]

Unsafe code and why you are using NS classes (NSCalendar, NSDateComponents) in Swift class?

[Jeet Gandhi]

Thanks for pointing out. Please check it.

[ssowri1]

Thank you for your help!