Return the previous business date of the date specified. : Date Time Util « Date Time « C# / C Sharp

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C# / C Sharp » Date Time » Date Time UtilScreenshots 
Return the previous business date of the date specified.
   
// crudwork
// Copyright 2004 by Steve T. Pham (http://www.crudwork.com)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with This program.  If not, see <http://www.gnu.org/licenses/>.

using System;
using System.Collections.Generic;
using System.Text;

namespace crudwork.Utilities
{
  /// <summary>
  /// Date Utility
  /// </summary>
  public class DateUtil
  {
    /// <summary>
    /// return the previous business date of the date specified.
    /// </summary>
    /// <param name="today"></param>
    /// <returns></returns>
    public static DateTime PreviousBusinessDay(DateTime today)
    {
      DateTime result;
      switch (today.DayOfWeek)
      {
        case DayOfWeek.Sunday:
          result = today.AddDays(-2);
          break;

        case DayOfWeek.Monday:
          result = today.AddDays(-3);
          break;

        case DayOfWeek.Tuesday:
        case DayOfWeek.Wednesday:
        case DayOfWeek.Thursday:
        case DayOfWeek.Friday:
          result = today.AddDays(-1);
          break;

        case DayOfWeek.Saturday:
          result = today.AddDays(-1);
          break;

        default:
          throw new ArgumentOutOfRangeException("DayOfWeek=" + today.DayOfWeek);
      }
      return ScreenHolidays(result, -1);
    }
    /// <summary>
    /// Return the previous or next business day of the date specified.
    /// </summary>
    /// <param name="today"></param>
    /// <param name="addValue"></param>
    /// <returns></returns>
    public static DateTime GetBusinessDay(DateTime today, int addValue)
    {
      #region Sanity Checks
      if ((addValue != -1&& (addValue != 1))
        throw new ArgumentOutOfRangeException("addValue must be -1 or 1");
      #endregion

      if (addValue > 0)
        return NextBusinessDay(today);
      else
        return DateUtil.PreviousBusinessDay(today);
    }



    /// <summary>
    /// return the next business date of the date specified.
    /// </summary>
    /// <param name="today"></param>
    /// <returns></returns>
    public static DateTime NextBusinessDay(DateTime today)
    {
      DateTime result;
      switch (today.DayOfWeek)
      {
        case DayOfWeek.Sunday:
        case DayOfWeek.Monday:
        case DayOfWeek.Tuesday:
        case DayOfWeek.Wednesday:
        case DayOfWeek.Thursday:
          result = today.AddDays(1);
          break;

        case DayOfWeek.Friday:
          result = today.AddDays(3);
          break;

        case DayOfWeek.Saturday:
          result = today.AddDays(2);
          break;

        default:
          throw new ArgumentOutOfRangeException("DayOfWeek=" + today.DayOfWeek);
      }
      return ScreenHolidays(result, 1);
    }


    /// <summary>
    /// return the mm/dd string of the date specified.
    /// </summary>
    /// <param name="time"></param>
    /// <returns></returns>
    public static string MonthDay(DateTime time)
    {
      return String.Format("{0:00}/{1:00}", time.Month, time.Day);
    }

    /// <summary>
    /// screen for holidays 
    /// (simple mode)
    /// </summary>
    /// <param name="result"></param>
    /// <param name="addValue"></param>
    /// <returns></returns>
    public static DateTime ScreenHolidays(DateTime result, int addValue)
    {
      #region Sanity Checks
      if ((addValue != -1&& (addValue != 1))
        throw new ArgumentOutOfRangeException("addValue must be -1 or 1");
      #endregion

      // holidays on fixed date
      switch (MonthDay(result))
      {
        case "01/01":  // Happy New Year
        case "07/04":  // Independent Day
        case "12/25":  // Christmas
          return GetBusinessDay(result, addValue);
        default:
          return result;
      }
    }    
    }
}

   
    
    
  
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