Date Equality Swift

DateEquality.swift

// Want to check equality of two Date instances *in your tests?* (you should never rely on this in
// production). Add this extension to avoid
// rounding errors when using different initializers.
// See: https://twitter.com/benjaminencz/status/794606769360076800
extension Date {
    public static func ==(lhs: Date, rhs: Date) -> Bool {
        return lhs.timeIntervalSinceReferenceDate == rhs.timeIntervalSinceReferenceDate ||
            lhs.timeIntervalSince1970 == rhs.timeIntervalSince1970
    }
}

// ---------------------------------------------------------------------------------------

// "Test"
for i in 1...100 {
    let refDate = Date()
    let result = refDate == Date(timeIntervalSince1970: refDate.timeIntervalSince1970)

    if !result {
        // You will see an indeterminate, yet high, amount of "oh-oh"s without the extension above.
        print("oh-oh \(i)")
    }
}