Set a Datestyle in Swift

Set a datestyle in Swift

Thanks to type inference you can do this

dateFormatter.dateStyle = .medium

How to format date in 09-Nov-2014 format with DateFormatter in iOS & Swift?

Don't set the styles. Just set the format.

You use either dateFormat or you use dateStyle and timeStyle.

Please note it's best to avoid using dateFormat for dates you wish to show to the user since your hardcoded format won't be standard for most users.

Also be aware that MM show the month number. If you want the abbreviated month name, use MMM.

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 do I make a day come first while using the dateStyle in Swift

You don't actually need to change anything in your code. Just switch your Simulator's Region (Settings -> General -> Language & Region) to a place that uses the little endian (day, month, year) style (here's a list). A typical example is the UK.

If you want to always show the day first, regardless of the user's region, you can set the locale of the date formatter to one of those countries listed above:

dateFormatter.locale = Locale(identifier: "en-GB")

But I don't recommend this. You should not disrespect the user's language and region and their preferred date format unless you have a really good reason.

How to format dates in Swift?

The following will do. Note that I used stringFromDate twice with different format strings, instead of splitting the formatted date as you wanted. Using stringFromDate twice is more independent from the format.

Also creation of NSDateFormatter is a bit expensive, it's best to reuse it.

let z = "2014-03-18T03:31:14.000Z"
let fmt = NSDateFormatter()
fmt.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
let date = fmt.dateFromString(z)!

fmt.timeZone = NSTimeZone(abbreviation: "Australia/Brisbane")
fmt.dateFormat = "yyyy-MM-dd"
let dateString = fmt.stringFromDate(date)

fmt.dateFormat = "h:mm a"
let timeString = fmt.stringFromDate(date)

print("date: \(dateString), time: \(timeString)")

Swift - Convert a short format string of a date to long format using date formatter

Removing the dateStyle line fixes it, and an actual date is printed.

Code:

func stringToDate(dateString: String){
    let formatter = DateFormatter()
    formatter.locale = Locale(identifier: "en_US_POSIX")
    formatter.dateFormat = "yyyy-MM-dd"

    let newDate = formatter.date(from: dateString)
    print("formatter: \(newDate)")
}

// Prints: formatter: Optional(2021-08-04 23:00:00 +0000)

To do the whole conversion, the following function will work:

func convertDate(from original: String) -> String? {
    let formatter = DateFormatter()
    formatter.locale = Locale(identifier: "en_US_POSIX")
    formatter.dateFormat = "yyyy-MM-dd"
    guard let date = formatter.date(from: original) else { return nil }
    formatter.dateStyle = .long
    let string = formatter.string(from: date)
    return string
}

// Prints: Optional("August 5, 2021")

Of course, this may be printed slightly different due to my location & language

The following line of code can only be run after getting a Date otherwise you are 'overwriting' the dateFormat:

formatter.dateStyle = .long

How can you make date formatter in Swift to show only the year part of the date?

If you need to define a format that cannot be achieved using the predefined styles, you can use the setLocalizedDateFormatFromTemplate(_:) to specify a localized date format from a template.

Source: DateFormatter - Foundation

In your case:

dateFormatter.setLocalizedDateFormatFromTemplate("yyyy")

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")

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