@swift-5.0.3
import Foundation public extension String.StringInterpolation { mutating func appendInterpolation(_ value: Date, _ formatter: DateFormatter) { appendLiteral(formatter.string(from: value)) } } public extension DateFormatter { static func format(date: Style, time: Style) -> DateFormatter { let formatter = DateFormatter() formatter.locale = Locale.current (formatter.dateStyle, formatter.timeStyle) = (date, time) return formatter } } let formatter = DateFormatter.format(date: .none, time: .long) print("\(Date(), formatter)")