Add Date.numberOfDaysInYear

[nuomi1]

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What did you do?

Provide a compute property.

What did you expect to happen?

Get days in year for Date.

What happened instead?

Please replace this with of what happened instead.

SwifterSwift Environment

• SwifterSwift version: 4.4.0
• Xcode version: 9.4.1
• macOS version running Xcode: 10.13.6
• Swift version: 4.1.2
• Platform(s) running SwifterSwift: macOS

Demo Project

extension Date {
    var numberOfDaysInYear: Int {
        return Calendar.current.ordinality(of: .day, in: .year, for: self)!
    }
}

let now = Date()

dump(now)
print(now.numberOfDaysInYear)

▿ 2018-08-25 08:43:25 +0000
  - timeIntervalSinceReferenceDate: 556879405.01351404
237

[spacelatte]

imho: name should be numberOfDaysLeftInYear or something like it.
because number-of-days-in-year is either 365 or 366 depending on leap-year

[guykogus]

Actually the code example is dayInYear. To get numberOfDaysLeftInYear it would be calculated as such:

extension Date {
    var dayInYear: Int {
        return Calendar.current.ordinality(of: .day, in: .year, for: self)!
    }

    var numberOfDaysInYear: Int {
        return Calendar.current.range(of: .day, in: .year, for: self)!.upperBound - 1
    }

    var numberOfDaysLeftInYear: Int {
        return numberOfDaysInYear - dayInYear
    }
}

Date().numberOfDaysLeftInYear // 81 (for Oct 11, 2018)