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

Answer 1

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 }
    }

}