Swift: Can't Get Nsdate Dateformatter Right

Swift: can't get NSDate dateFormatter right

It looks like your date formatter is a bit off. "MM'/'DD'/'YYYY" reads "Padded month / day of the year (not month) / year of the current week (so Jan 1-6 could overlap and add side-effects)"

I'm guessing that what you're aiming for is "MM'/'dd'/'yyyy", which reads "Padded month / padded day of month / year"

For reference, here's the currently-used Unicode Technical Standard that Apple documents as their standard for iOS 7+ and OSX 10.9+ here

Can't find the right date formatter (DateFormatter) in iphone

In Swift 3
You can change your server time string to UTC time Date as:

let dateFormatter: DateFormatter = DateFormatter()
var serverDateString = "2017-08-05T00:30:00.000+02:00"
let index = serverDateString.index(serverDateString.startIndex, offsetBy: 19)
serverDateString = serverDateString.substring(to: index)
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
dateFormatter.timeZone = TimeZone.init(identifier: "UTC")
let currentDate: Date = dateFormatter.date(from: serverDateString)!

Can't Convert Date Format Into Display Date In Swift

You should always set your dateFormat locale to "en_US_POSIX" before setting the dateFormat. Btw it looks like that your date string you are reading from database is always in UTC format, if that is the case you should set your dateFormatter timezone to zero secondsFromGMT and escape your date string timezone:

let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US_POSSIX")
dateFormatter.dateFormat = "EEE MMM dd yyyy HH:mm:ss 'GMT+0000 (Greenwich Mean Time)'"
dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
dateFormatter.date(from: "Thu Nov 12 2020 07:00:00 GMT+0000 (Greenwich Mean Time)")

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You should also create a static date formatter to avoid creating a new one every time you call this method:

---

extension Formatter {
    static let customDate: DateFormatter = {
        let dateFormatter = DateFormatter()
        dateFormatter.locale = Locale(identifier: "en_US_POSSIX")
        dateFormatter.dateFormat = "EEE MMM dd yyyy HH:mm:ss 'GMT+0000 (Greenwich Mean Time)'"
        dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
        return dateFormatter
    }()
    static let yyyyMMMd: DateFormatter = {
        let dateFormatter = DateFormatter()
        dateFormatter.setLocalizedDateFormatFromTemplate("yyyyMMMd")
        return dateFormatter
    }()
}

---

extension String {
    func convertToDate() -> Date? {
        Formatter.customDate.date(from: self)
    }
    func convertToDisplayFormat() -> String {
        convertToDate()?.convertToMonthDayTimeFormat() ?? "N/A"
    }
}

---

extension Date {
    func convertToMonthDayTimeFormat() -> String {
        Formatter.yyyyMMMd.string(from: self)
    }
}

---

Playground testing:

"Thu Nov 12 2020 07:00:00 GMT+0000 (Greenwich Mean Time)".convertToDisplayFormat()  // "Nov 12, 2020"

Swift dateformatter.date(from: string) strange behaviour

The problem is with the date format.

change these lines:

df.dateFormat="YYYY.MM.dd"
df.dateFormat="dd.MM.YYYY"

to this:

df.dateFormat="yyyy.MM.dd"
df.dateFormat="dd.MM.yyyy"

Date formatting not working in Swift 3

Date().toString() // convert date to string with userdefined format.

extension Date {
        func toString() -> String {
            let dateFormatter = DateFormatter()
            dateFormatter.dateFormat = "MMMM dd yyyy"
            return dateFormatter.string(from: self)
        }
    }

DateFormatter. Strange behaviour on iOS 13.4.1 while 12 hour date style set in the iOS settings

The problem is fixed. Locale needs to be set.

formatter.locale = Locale(identifier: "en_US_POSIX")

Dateformatter issue in swift

With help of @Martin R, Following code worked for me.

    let sourceDateString = "12/20/2016 11:45 AM"
    let formatter = DateFormatter()
    formatter.dateFormat = "MM/dd/yyyy hh:mm a"
    formatter.timeZone = TimeZone(identifier: "UTC")
    formatter.locale = Locale(identifier: "en_US_POSIX")
    let date = formatter.date(from: sourceDateString)

    print(date)

    formatter.timeZone = NSTimeZone.local
    formatter.dateFormat = "MMM dd,yyyy hh:mm a"

    let strDate = formatter.string(from: date!)
    print(strDate)

I forgot to add "POSIX".

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