// 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; } } } }