Duration
constructor(years: Int = definedExternally, months: Int = definedExternally, weeks: Int = definedExternally, days: Int = definedExternally, hours: Int = definedExternally, minutes: Int = definedExternally, seconds: Int = definedExternally, milliseconds: Int = definedExternally, microseconds: Int = definedExternally, nanoseconds: Int = definedExternally)(source)