I am using this to get min hours day like 2 day ago suggest me another way

/// <summary>
       /// this is for get postfix for numbers
       /// </summary>
       /// <param name="number"></param>
       /// <returns></returns>
       public static string ToOrdinal(int number)
       {
           switch (number % 100)
           {
               case 11:
               case 12:
               case 13:
                   return number + "th";
           }

           switch (number % 10)
           {
               case 1:
                   return number + "st";
               case 2:
                   return number + "nd";
               case 3:
                   return number + "rd";
               default:
                   return number + "th";
           }
       }