Extension for Date class that provides easy-to-use feature for convering date to string. Swift 3

Date+String.swift

extension Date {
    struct Formatter {
        static let shortDate = DateFormatter(dateStyle: .short)
        static let longDate = DateFormatter(dateStyle: .long)
        static let fullDate = DateFormatter(dateStyle: .full)
    }
    
    var shortDate: String { return Formatter.shortDate.string(from: self) }
    var longDate: String { return Formatter.longDate.string(from: self) }
    var fullDate: String { return Formatter.fullDate.string(from: self) }
    
    var mediumTime: String {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "HH:mm"
        dateFormatter.locale = Locale.current
        return dateFormatter.string(from: self)
    }
    
    var longTime: String {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "HH:mm:ss"
        dateFormatter.locale = Locale.current
        return dateFormatter.string(from: self)
    }
    
}