/// <summary>
/// Returns the date of the last day of the week ending on <paramref name="startOfWeek"/>, which contains <paramref name="date"/>.
/// </summary>
/// <param name="date"></param>
/// <param name="startOfWeek"></param>
/// <returns></returns>
public static DateTime EndOfWeek(this DateTime date, DayOfWeek startOfWeek = DayOfWeek.Sunday)
{
return(DDRIT.EndOfWeek(date, startOfWeek));
}