Date Format in Swift

Date Format in Swift

You have to declare 2 different NSDateFormatters, the first to convert the string to a NSDate and the second to print the date in your format.

Try this code:

let dateFormatterGet = NSDateFormatter()
dateFormatterGet.dateFormat = "yyyy-MM-dd HH:mm:ss"

let dateFormatterPrint = NSDateFormatter()
dateFormatterPrint.dateFormat = "MMM dd,yyyy"

let date: NSDate? = dateFormatterGet.dateFromString("2016-02-29 12:24:26")
print(dateFormatterPrint.stringFromDate(date!))

Swift 3 and higher:

From Swift 3 NSDate class has been changed to Date and NSDateFormatter to DateFormatter.

let dateFormatterGet = DateFormatter()
dateFormatterGet.dateFormat = "yyyy-MM-dd HH:mm:ss"

let dateFormatterPrint = DateFormatter()
dateFormatterPrint.dateFormat = "MMM dd,yyyy"

if let date = dateFormatterGet.date(from: "2016-02-29 12:24:26") {
    print(dateFormatterPrint.string(from: date))
} else {
   print("There was an error decoding the string")
}

How to do a proper Date formatter in Swift

You don't need two date formatters to convert one date string to another.

My suggestion is to create one persistent date formatter with a fixed locale

let dateFormatter : DateFormatter = {
    let formatter = DateFormatter()
    formatter.locale = Locale(identifier: "en_US_POSIX")
    return formatter
}()

This could be also an extension

extension DateFormatter {
    static let posixFormatter : DateFormatter = {
        let formatter = DateFormatter()
        formatter.locale = Locale(identifier: "en_US_POSIX")
        return formatter
    }()
}

And secondly a function with parameters for input format with a default value and output format

func formatDate(dateString: String, inFormat: String = "yyyy-MM-dd'T'HH:mm:ss.SSSZ", outFormat: String) -> String? {

    // let dateFormatter = DateFormatter.posixFormatter
   
    //this is format I get from my response
    dateFormatter.dateFormat = inFormat
    guard let date = dateFormatter.date(from: dateString) else { return nil }

    dateFormatter.dateFormat = outFormat
    return dateFormatter.string(from: date)
}

You have to check if a date could be created from the string so the return value is an optional.

Side note:

The Z in an ISO8601 string is the time zone specifier. It must not be wrapped in single quotes. And the year specifier is always lowercase yyyy.

How to change date format from dd MMMM YYYY in swift?

Using DateFormatter is right way to do. First you need to convert the 01 August 2021 , String type, to Date object. Second, change dateFormat and re-format it. Here is tested code for both of your need:

func convert(_ dateString: String, from initialFormat: String, to targetFormat: String? = nil, _ locale: Locale? = nil) -> String? {
    let formatter = DateFormatter()
    formatter.dateFormat = initialFormat
    guard let date = formatter.date(from: dateString) else { return nil }
    
    if let newFormat = targetFormat {
        formatter.dateFormat = targetFormat
    }
    formatter.locale = locale
    return formatter.string(from: date)
}

print(convert("01 August 2021", from: "dd MMMM yyyy", .init(identifier: "id_ID")))
print(convert("01 August 2021", from: "dd MMMM yyyy", to: "dd-MM-yyyy"))

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)")

---

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"

Issue in formatting Date in swift 4

HH:mm:ss gives you the time in 24 hour format, so a doesn't make sense inside the format. Or you can use hh:mm:ss a.

Date() gives you the time in UTC. You need to provide the timezone information to get the date in your timezone.

    let date = Date()
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "dd-MMM-yyyy HH:mm:ss"
    dateFormatter.timeZone = .current
    let localDate = dateFormatter.string(from: date)
    
    print(localDate)

localDate will give you the date in your current timezone.

Date to String [format string] String to Date in Swift

This should fix your issue

func convertStartDate(StartDate: Date) -> Date {

    let dateFormatter = DateFormatter()
    dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
    dateFormatter.dateFormat = "yyy-MM-dd '00':'00':'01' +0000"
    let dateString = dateFormatter.string(from: StartDate)
    dateFormatter.dateFormat = "yyy-MM-dd HH:mm:ss +0000"
    let date = dateFormatter.date(from: dateString)
    print(date as Any)

    return date!
}

func convertEndDate(EndDate: Date) -> Date {

    let dateFormatter = DateFormatter()
    dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
    dateFormatter.dateFormat = "yyy-MM-dd '23':'59':'59' +0000"
    let dateString = dateFormatter.string(from: EndDate)
    dateFormatter.dateFormat = "yyy-MM-dd HH:mm:ss +0000"
    let date = dateFormatter.date(from: dateString)

    return date!
}

how to change date format 2021-30-06T05:00:00+07:00 in swift?

Your 2021-30-06T05:00:00+07:00 is not matching with yyyy-MM-dd'T'HH:mm:ss.

Date format should be yyyy-dd-MM'T'HH:mm:ssZZZZZ.

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-dd-MM'T'HH:mm:ssZZZZZ"
let date = dateFormatter.date(from: "2021-30-06T05:00:00+07:00")

// change to a readable time format and change to local time zone
dateFormatter.dateFormat = "HH:mm:ss"
dateFormatter.timeZone = TimeZone.current
let timeStamp = dateFormatter.string(from: date!)
print(timeStamp)

Output:

03:30:00  // This is as per my current timezone.

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