How do I find the number of days in given month and year using swift

Question

I want to find the total number days on given month and year. Example: I want to find total number of days on year = 2015, month = 7

score 131 · Accepted Answer · edited May 23 '17 at 12:02

131

First create an NSDate for the given year and month:

let dateComponents = NSDateComponents()
dateComponents.year = 2015
dateComponents.month = 7

let calendar = NSCalendar.currentCalendar()
let date = calendar.dateFromComponents(dateComponents)!

Then use the rangeOfUnit() method, as described in Number of days in the current month using iPhone SDK?:

// Swift 2:
let range = calendar.rangeOfUnit(.Day, inUnit: .Month, forDate: date)
// Swift 1.2:
let range = calendar.rangeOfUnit(.CalendarUnitDay, inUnit: .CalendarUnitMonth, forDate: date)

let numDays = range.length
print(numDays) // 31

Update for Swift 3 (Xcode 8):

let dateComponents = DateComponents(year: 2015, month: 7)
let calendar = Calendar.current
let date = calendar.date(from: dateComponents)!

let range = calendar.range(of: .day, in: .month, for: date)!
let numDays = range.count
print(numDays) // 31

edited May 23 '17 at 12:02

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answered Jul 23 '15 at 15:09

Martin R

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This is definitely a lot cleaner than mine. – mbottone Jul 23 '15 at 16:13
Hi Martin can please look into this http://stackoverflow.com/questions/31595260/how-to-scroll-the-entire-section-horizontally-in-collectionview-swift – Shrestha Ashesh Jul 24 '15 at 05:46
@ShresthaAshesh: I don't think that I can help you with that one, sorry. – Martin R Jul 24 '15 at 06:57
and what if we have to get all the dates of month – shubh14896 Apr 14 '18 at 04:35
@MartinR may you please tell that can we get day only from month if year is not given ? – AbecedarioPoint Jul 17 '18 at 09:21

score 19 · Answer 2 · edited Jan 07 '21 at 18:00

19

Updated for Swift 3.1, Xcode 8+, iOS 10+

let calendar = Calendar.current
let date = Date()

// Calculate start and end of the current year (or month with `.month`):
let interval = calendar.dateInterval(of: .year, for: date)! //change year it will no of days in a year , change it to month it will give no of days in a current month

// Compute difference in days:
let days = calendar.dateComponents([.day], from: interval.start, to: interval.end).day!
print(days)

edited Jan 07 '21 at 18:00

אורי orihpt

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answered Feb 28 '17 at 12:52

Abdul Karim

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Also iOS 10.0+ only. – dvs Mar 14 '18 at 13:20

score 16 · Answer 3 · answered Feb 04 '17 at 19:03

In extension format, using self to be able to return the number of days more dynamically (Swift 3).

extension Date {

func getDaysInMonth() -> Int{
    let calendar = Calendar.current

    let dateComponents = DateComponents(year: calendar.component(.year, from: self), month: calendar.component(.month, from: self))
    let date = calendar.date(from: dateComponents)!

    let range = calendar.range(of: .day, in: .month, for: date)!
    let numDays = range.count

    return numDays
}

}

score 3 · Answer 4 · edited Jun 14 '21 at 06:35

Swift 5.0

func getDaysInMonth(month: Int, year: Int) -> Int? {
        let calendar = Calendar.current

        var startComps = DateComponents()
        startComps.day = 1
        startComps.month = month
        startComps.year = year

        var endComps = DateComponents()
        endComps.day = 1
        endComps.month = month == 12 ? 1 : month + 1
        endComps.year = month == 12 ? year + 1 : year

        
        let startDate = calendar.date(from: startComps)!
        let endDate = calendar.date(from:endComps)!

        
        let diff = calendar.dateComponents([Calendar.Component.day], from: startDate, to: endDate)

        return diff.day
    }
    if let numberOfDays = getDaysInMonth(month: 1, year: 2015) {
     print(numberOfDays)

     }

Swift 2.0

func getDaysInMonth(month: Int, year: Int) -> Int
{
    let calendar = NSCalendar.currentCalendar()

    let startComps = NSDateComponents()
    startComps.day = 1
    startComps.month = month
    startComps.year = year

    let endComps = NSDateComponents()
    endComps.day = 1
    endComps.month = month == 12 ? 1 : month + 1
    endComps.year = month == 12 ? year + 1 : year

    let startDate = calendar.dateFromComponents(startComps)!
    let endDate = calendar.dateFromComponents(endComps)!

    let diff = calendar.components(NSCalendarUnit.Day, fromDate: startDate, toDate: endDate, options: NSCalendarOptions.MatchFirst)

    return diff.day
}

let days = getDaysInMonth(4, year: 2015) // April 2015 has 30 days
print(days) // Prints 30

Swift 1.2

func getDaysInMonth(month: Int, year: Int) -> Int
{
    let calendar = NSCalendar.currentCalendar()

    let startComps = NSDateComponents()
    startComps.day = 1
    startComps.month = month
    startComps.year = year

    let endComps = NSDateComponents()
    endComps.day = 1
    endComps.month = month == 12 ? 1 : month + 1
    endComps.year = month == 12 ? year + 1 : year

    let startDate = calendar.dateFromComponents(startComps)!
    let endDate = calendar.dateFromComponents(endComps)!

    let diff = calendar.components(NSCalendarUnit.CalendarUnitDay, fromDate: startDate, toDate: endDate, options: NSCalendarOptions.allZeros)

    return diff.day
}

let days = getDaysInMonth(4, 2015) // There were 30 days in April 2015
println(days) // Prints 30

Its working on swift 1.2, but shows error in swift 2.0 (Xcode 7) on NScalendarUnit.CalendarUnitDay. — Shrestha Ashesh, Jul 23 '15 at 14:58
You should add that kind of information to your question in the future. — mbottone, Jul 23 '15 at 15:01
http://stackoverflow.com/questions/30798561/xcode-7-beta-differences-in-nsdatecomponents/30798673#30798673 — Eric Aya, Jul 23 '15 at 15:03

score 3 · Answer 5 · answered Jan 02 '18 at 13:42

In order to get number of days and all the dates on given month and year, try this.

func getAllDates(month: Int, year: Int) -> [Date] {
    let dateComponents = DateComponents(year: year, month: month)
    let calendar = Calendar.current
    let date = calendar.date(from: dateComponents)!

    let range = calendar.range(of: .day, in: .month, for: date)!
    let numDays = range.count
    let formatter = DateFormatter()
    formatter.dateFormat = "yyyy MM dd"
    formatter.timeZone = TimeZone(abbreviation: "GMT+0:00")
    var arrDates = [Date]()
    for day in 1...numDays {
        let dateString = "\(year) \(month) \(day)"
        if let date = formatter.date(from: dateString) {
            arrDates.append(date)
        }
    }

    return arrDates
}

Usage:

let arrDatesInGivenMonthYear = getAllDates(month: 1, year: 2018)
debugPrint(arrDatesInGivenMonthYear)
//Output: [2018-01-01 00:00:00 +0000, 2018-01-02 00:00:00 +0000, ... , 2018-01-31 00:00:00 +0000]

let numberOfDays = arrDatesInGivenMonthYear.count
debugPrint(numberOfDays)
//Output: 31

score 3 · Answer 6 · edited Jun 18 '21 at 20:49

Swift 5

Another way to approach this:

extension Date {
    
    func daysInMonth(_ monthNumber: Int? = nil, _ year: Int? = nil) -> Int {
        var dateComponents = DateComponents()
        dateComponents.year = year ?? Calendar.current.component(.year,  from: self)
        dateComponents.month = monthNumber ?? Calendar.current.component(.month,  from: self)
        if
            let d = Calendar.current.date(from: dateComponents),
            let interval = Calendar.current.dateInterval(of: .month, for: d),
            let days = Calendar.current.dateComponents([.day], from: interval.start, to: interval.end).day
        { return days } else { return -1 }
    }

}

score 1 · Answer 7 · answered Oct 08 '18 at 17:36

1

here is the swift 4.0 version

func getTotalDate(){
    // choose the month and year you want to look
    var dateComponents = DateComponents()
    dateComponents.year = 2018
    dateComponents.month = 10

    let calendar = Calendar.current
    let datez = calendar.date(from: dateComponents)
    // change .month into .year to see the days available in the year
    let interval = calendar.dateInterval(of: .month, for: datez!)!

    let days = calendar.dateComponents([.day], from: interval.start, to: interval.end).day!
    print(days)
}

answered Oct 08 '18 at 17:36

This is the only answer here which returns the correct answer. `calendar.range(of: .day, in: .year, for: Date())!` always returns 31 – Mike Hay Jun 11 '19 at 21:57
1

@MikeHay: *“... always returns 31”* – I don't think so. If you think that the other answers are wrong then I suggest to leave a comment at those answers, with a concrete example. – Martin R Nov 03 '19 at 12:08

score 0 · Answer 8 · answered Jan 22 '17 at 16:58

0

What about for a given year?

The following is printing the number of days in the date's month:

let range = userCalendar.range(of: .day, in: .year, for: Date())!
print("Days In Year: \(range.count)") // prints 31

... and not the number of days in the date's year as expected :/

answered Jan 22 '17 at 16:58

Chris Allinson

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Hello, found this bug too, its result as 31 on iOS 10 only, on iOS 11 works as expected. – Mike Demidov Mar 29 '18 at 08:57
did not work in ios 13 ( I checked only on iOS 13 ) – YodagamaHeshan Jun 06 '20 at 05:07

How do I find the number of days in given month and year using swift

8 Answers8

Updated for Swift 3.1, Xcode 8+, iOS 10+

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