C# copyright string helper method that takes a DateTime and optionally a string to output something like: © 2010-2022 Company

CopyrightHelper.cs

    /// <summary>
    /// Gets a copyright string in the form of: "© 2022 CompanyName" or like "© 2016-2022 Person"
    /// </summary>
    /// <param name="CopyrightStart">DateTime that represents the start date of copyright - only the year is used.</param>
    /// <param name="CopyrightHolder">Optional string of copyright holder - empty string is default</param>
    /// <returns>Copyright string</returns>
    public static string GetCopyrightString(DateTime CopyrightStart, string CopyrightHolder = "")
    {
      string CopyrightString = string.Empty;

      // If Copyright year is greater or equal to the current year, only use copyright year e.g. 2022
      if (CopyrightStart.Year >= DateTime.Now.Year)
      {
        CopyrightString = "© " + CopyrightStart.Year + " " + CopyrightHolder;
      }
      // If Copyright year is less than the current year, use range of copyright year to current year e.g. 2021-2022
      else if (CopyrightStart.Year < DateTime.Now.Year)
      {
        CopyrightString = "© " + CopyrightStart.Year + "-" + DateTime.Now.Year + " " + CopyrightHolder;
      }

      return CopyrightString;
    }