Convert String to Date Type in Swift 3

Convert string to date in Swift

• Convert the ISO8601 string to date

    let isoDate = "2016-04-14T10:44:00+0000"
  
    let dateFormatter = DateFormatter()
    dateFormatter.locale = Locale(identifier: "en_US_POSIX") // set locale to reliable US_POSIX
    dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZ"
    let date = dateFormatter.date(from:isoDate)!
  

• Get the date components for year, month, day and hour from the date

    let calendar = Calendar.current
    let components = calendar.dateComponents([.year, .month, .day, .hour], from: date)
  

• Finally create a new Date object and strip minutes and seconds

    let finalDate = calendar.date(from:components)
  

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Consider also the convenience formatter ISO8601DateFormatter introduced in iOS 10 / macOS 10.12:

let isoDate = "2016-04-14T10:44:00+0000"

let dateFormatter = ISO8601DateFormatter()
let date = dateFormatter.date(from:isoDate)!

How to convert string to date to string in Swift iOS?

First, you need to convert your string to NSDate with its format. Then, you change the dateFormatter to your simple format and convert it back to a String.

Swift 3

let dateString = "Thu, 22 Oct 2015 07:45:17 +0000"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "EEE, dd MMM yyyy hh:mm:ss +zzzz"
dateFormatter.locale = Locale.init(identifier: "en_GB")

let dateObj = dateFormatter.date(from: dateString)

dateFormatter.dateFormat = "MM-dd-yyyy"
print("Dateobj: \(dateFormatter.string(from: dateObj!))")

The printed result is: Dateobj: 10-22-2015

How can I convert string date to NSDate?

try this:

let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = /* find out and place date format from 
                            * http://userguide.icu-project.org/formatparse/datetime
                            */
let date = dateFormatter.dateFromString(/* your_date_string */)

For further query, check NSDateFormatter and DateFormatter classes of Foundation framework for Objective-C and Swift, respectively.

Swift 3 and later (Swift 4 included)

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = /* date_format_you_want_in_string from
                            * http://userguide.icu-project.org/formatparse/datetime
                            */
guard let date = dateFormatter.date(from: /* your_date_string */) else {
   fatalError("ERROR: Date conversion failed due to mismatched format.")
}

// use date constant here

How to convert date string into date in swift 3

Use this string class extension

   extension String {
    func date(format: String) -> Date? {
            let dateFormatter = DateFormatter()
            dateFormatter.dateFormat = format
            dateFormatter.timeZone =TimeZone.current
            let date = dateFormatter.date(from: self)
            return date
        }
    }

use above function like this

let date = "07/06/2017 11:23 AM".date(format:"MM/dd/yyyy HH:mm a")

swift 3 - can not convert string to date

If your are pretty sure that buffers["pubDate"]! is equal to "Sun, 02 Apr 2017 19:31:18 GMT" (or any date with the same format), then it should be:

var dateBuffer: Date {
    let formatter = DateFormatter()
    formatter.dateFormat = "EEE, dd MMM yyyy HH:mm:ss zzz"
    let date = formatter.date(from: buffers["pubDate"]!)
    return date!
}

Note that the difference is HH:mm:ss instead of hh:mm:ss. For reading the hours as 24-clock convention, you should use HH.

Also, to be more safe -from any unexpected crash-, I'd suggest to do some optional binding, as follows:

var dateBuffer: Date? {
    let formatter = DateFormatter()
    let str:String? = "Sun, 02 Apr 2017 19:31:18 GMT"

    formatter.dateFormat = "EEE, dd MMM yyyy HH:mm:ss zzz"
    if let pubDate = buffers["pubDate"], let date = formatter.date(from: pubDate) {
        return date
    }

    return nil
}

if let myDate = dateBuffer {
    print(myDate)
}

Converting a String to a Date in Swift

The date format needs to be for the string you are trying to convert, not the format you want back

so

formatter.dateFormat = "dd MM YYYY"

should be

formatter.dateFormat = "E, d MMM yyyy HH:mm:ss Z"

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