Parsing a Swift String to Date, then Components

Question

I have a date "2017-12-31" as a String.

What I want to get finally is only the month: "12" as a String.

So I thought that I can change it to Date using a date formatter

let formatter = DateFormatter()
formatter.dateFormat = "MM"

What do I do next?

Ankit Prajapati · Accepted Answer · 2017-11-25 10:50:19Z

3

let dateString = "2017-12-31"    
let formatter = DateFormatter()
formatter.calendar = Calendar(identifier: Calendar.Identifier.iso8601)    formatter.timeZone = TimeZone(identifier:  TimeZone.autoupdatingCurrent.identifier)
formatter.dateFormat = "yyyy-MM-dd" 
let localDate = formatter.date(from: dateString) 
formatter.dateFormat = "MM" 
let strMonth = formatter.string(from: localDate!)
print("Month is:",strMonth)

Another way

let dateString = "2017-12-31"
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd"
let localDate = formatter.date(from: dateString)
let month = String(NSCalendar.current.component(.month, from: localDate!))
print(month)

answered Nov 25, 2017 at 10:50

Ankit Prajapati

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2 Comments

Leo Dabus Over a year ago

the current timezone it is used by the default so it is not needed. Btw why not simply formatter.timeZone = .autoupdatingCurrent. And don't force unwrap your date. It would crash the app in case of an invalid date string.

Leo Dabus Over a year ago

And Swift 3 or later you should drop the NS and use Calendar instead of NSCalendar. Note that for stand alone month it is recommended to use "LL" instead of "MM" i.sstatic.net/lkYVY.png

André Slotta · Accepted Answer · 2017-11-25 10:05:05Z

2

First you have to use the DateFormatter to create a temporary Date object from your source String object. Then you have to use it to create your final String from the temporary Date object.

let dateString = "2017-12-31"
let dateFormatter = DateFormatter()

// set the dateFormatter's dateFormat to the dateString's format
dateFormatter.dateFormat = "yyyy-MM-dd"

// create date object
guard let tempDate = dateFormatter.date(from: dateString) else {
    fatalError("wrong dateFormat")
}

// set the dateFormatter's dateFormat to the output format you wish to receive
dateFormatter.dateFormat = "LL" // LL is the stand-alone month

let month = dateFormatter.string(from: tempDate)

answered Nov 25, 2017 at 10:05

André Slotta

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Comments

Sakir Sherasiya · Accepted Answer · 2017-11-25 10:32:55Z

2

Use below function for getting month from string file of date

func getMonthFromDateString(strDate: String) -> String {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd"
        let date = formatter.date(from: strDate) // Convert String File To Date
        formatter.dateFormat = "MM"
        let strMM = formatter.string(from: date!) // Convert date to string
        return strMM
}

edited Nov 25, 2017 at 10:32

answered Nov 25, 2017 at 10:10

Sakir Sherasiya

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1 Comment

André Slotta Over a year ago

I don't think it's working because yourDate is wrong... should be date... ;)

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