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jaylyerly/gist:0916b8f14f4a33ba2678b3ceb8a32353

Created June 12, 2019 13:46
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Get the number of days in the month containing the given date.
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gistfile1.txt
import Foundation
let jan1 = Date(timeIntervalSince1970: 24*60*60)
let days = (0...11).map {
Calendar.current.date(byAdding: .month, value: $0, to: jan1)!
}
days
let daysPerMonth = days.map {
Calendar.current.range(of: .day, in: .month, for: $0)!.max()
}
daysPerMonth
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