using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;namespace MSCL{  /// <summary>  /// 時間日期處理類  /// </summary>  public class DateTimeHelper  {    #region 返回本年有多少天    /// <summary>返回本年有多少天</summary>    /// <param name="iYear">年份</param>    /// <returns>本年的天數</returns>    public static int GetDaysOfYear(int iYear)    {      int cnt = 0;      if (IsRuYear(iYear))      {        //閏年多 1 天 即：2 月為 29 天        cnt = 366;      }      else      {        //--非閏年少1天 即：2 月為 28 天        cnt = 365;      }      return cnt;    }    #endregion    #region 返回本年有多少天    /// <summary>本年有多少天</summary>    /// <param name="dt">日期</param>    /// <returns>本天在當年的天數</returns>    public static int GetDaysOfYear(DateTime idt)    {      int n;      //取得傳入參數的年份部分，用來判斷是否是閏年      n = idt.Year;      if (IsRuYear(n))      {        //閏年多 1 天 即：2 月為 29 天        return 366;      }      else      {        //--非閏年少1天 即：2 月為 28 天        return 365;      }    }    #endregion    #region 返回本月有多少天    /// <summary>本月有多少天</summary>    /// <param name="iYear">年</param>    /// <param name="Month">月</param>    /// <returns>天數</returns>    public static int GetDaysOfMonth(int iYear, int Month)    {      int days = 0;      switch (Month)      {        case 1:          days = 31;          break;        case 2:          if (IsRuYear(iYear))          {            //閏年多 1 天 即：2 月為 29 天            days = 29;          }          else          {            //--非閏年少1天 即：2 月為 28 天            days = 28;          }          break;        case 3:          days = 31;          break;        case 4:          days = 30;          break;        case 5:          days = 31;          break;        case 6:          days = 30;          break;        case 7:          days = 31;          break;        case 8:          days = 31;          break;        case 9:          days = 30;          break;        case 10:          days = 31;          break;        case 11:          days = 30;          break;        case 12:          days = 31;          break;      }      return days;    }    #endregion    #region 返回本月有多少天    /// <summary>本月有多少天</summary>    /// <param name="dt">日期</param>    /// <returns>天數</returns>    public static int GetDaysOfMonth(DateTime dt)    {      //--------------------------------//      //--從dt中取得當前的年，月信息 --//      //--------------------------------//      int year, month, days = 0;      year = dt.Year;      month = dt.Month;      //--利用年月信息，得到當前月的天數信息。      switch (month)      {        case 1:          days = 31;          break;        case 2:          if (IsRuYear(year))          {            //閏年多 1 天 即：2 月為 29 天            days = 29;          }          else          {            //--非閏年少1天 即：2 月為 28 天            days = 28;          }          break;        case 3:          days = 31;          break;        case 4:          days = 30;          break;        case 5:          days = 31;          break;        case 6:          days = 30;          break;        case 7:          days = 31;          break;        case 8:          days = 31;          break;        case 9:          days = 30;          break;        case 10:          days = 31;          break;        case 11:          days = 30;          break;        case 12:          days = 31;          break;      }      return days;    }    #endregion    #region 返回當前日期的星期名稱    /// <summary>返回當前日期的星期名稱</summary>    /// <param name="dt">日期</param>    /// <returns>星期名稱</returns>    public static string GetWeekNameOfDay(DateTime idt)    {      string dt, week = "";      dt = idt.DayOfWeek.ToString();      switch (dt)      {        case "Mondy":          week = "星期一";          break;        case "Tuesday":          week = "星期二";          break;        case "Wednesday":          week = "星期三";          break;        case "Thursday":          week = "星期四";          break;        case "Friday":          week = "星期五";          break;        case "Saturday":          week = "星期六";          break;        case "Sunday":          week = "星期日";          break;      }      return week;    }    #endregion    #region 返回當前日期的星期編號    /// <summary>返回當前日期的星期編號</summary>    /// <param name="dt">日期</param>    /// <returns>星期數字編號</returns>    public static string GetWeekNumberOfDay(DateTime idt)    {      string dt, week = "";      dt = idt.DayOfWeek.ToString();      switch (dt)      {        case "Mondy":          week = "1";          break;        case "Tuesday":          week = "2";          break;        case "Wednesday":          week = "3";          break;        case "Thursday":          week = "4";          break;        case "Friday":          week = "5";          break;        case "Saturday":          week = "6";          break;        case "Sunday":          week = "7";          break;      }      return week;    }    #endregion    #region 判斷當前日期所屬的年份是否是閏年，私有函數    /// <summary>判斷當前日期所屬的年份是否是閏年，私有函數</summary>    /// <param name="dt">日期</param>    /// <returns>是閏年：True ，不是閏年：False</returns>    private static bool IsRuYear(DateTime idt)    {      //形式參數為日期類型      //例如：2003-12-12      int n;      n = idt.Year;      if ((n % 400 == 0) || (n % 4 == 0 && n % 100 != 0))      {        return true;      }      else      {        return false;      }    }    #endregion    #region 判斷當前年份是否是閏年，私有函數    /// <summary>判斷當前年份是否是閏年，私有函數</summary>    /// <param name="dt">年份</param>    /// <returns>是閏年：True ，不是閏年：False</returns>    private static bool IsRuYear(int iYear)    {      //形式參數為年份      //例如：2003      int n;      n = iYear;      if ((n % 400 == 0) || (n % 4 == 0 && n % 100 != 0))      {        return true;      }      else      {        return false;      }    }    #endregion    #region 將輸入的字符串轉化為日期。如果字符串的格式非法，則返回當前日期    /// <summary>    /// 將輸入的字符串轉化為日期。如果字符串的格式非法，則返回當前日期。    /// </summary>    /// <param name="strInput">輸入字符串</param>    /// <returns>日期對象</returns>    public static DateTime ConvertStringToDate(string strInput)    {      DateTime oDateTime;      try      {        oDateTime = DateTime.Parse(strInput);      }      catch (Exception)      {        oDateTime = DateTime.Today;      }      return oDateTime;    }    #endregion    #region 將日期對象轉化為格式字符串    /// <summary>    /// 將日期對象轉化為格式字符串    /// </summary>    /// <param name="oDateTime">日期對象</param>    /// <param name="strFormat">    /// 格式：    ///    "SHORTDATE"===短日期    ///    "LONGDATE"==長日期    ///    其它====自定義格式    /// </param>    /// <returns>日期字符串</returns>    public static string ConvertDateToString(DateTime oDateTime, string strFormat)    {      string strDate = "";      try      {        switch (strFormat.ToUpper())        {          case "SHORTDATE":            strDate = oDateTime.ToShortDateString();            break;          case "LONGDATE":            strDate = oDateTime.ToLongDateString();            break;          default:            strDate = oDateTime.ToString(strFormat);            break;        }      }      catch (Exception)      {        strDate = oDateTime.ToShortDateString();      }      return strDate;    }    #endregion    #region 判斷是否為合法日期，必須大于1800年1月1日    /// <summary>    /// 判斷是否為合法日期，必須大于1800年1月1日    /// </summary>    /// <param name="strDate">輸入日期字符串</param>    /// <returns>True/False</returns>    public static bool IsDateTime(string strDate)    {      try      {        DateTime oDate = DateTime.Parse(strDate);        if (oDate.CompareTo(DateTime.Parse("1800-1-1")) > 0)          return true;        else          return false;      }      catch (Exception)      {        return false;      }    }    #endregion    #region 獲取兩個日期之間的差值 可返回年 月 日 小時 分鐘 秒    /// <summary>    /// 獲取兩個日期之間的差值    /// </summary>    /// <param name="howtocompare">比較的方式可為：year month day hour minute second</param>    /// <param name="startDate">開始日期</param>    /// <param name="endDate">結束日期</param>    /// <returns>時間差</returns>    public static double DateDiff(string howtocompare, DateTime startDate, DateTime endDate)    {      double diff = 0;      try      {        TimeSpan TS = new TimeSpan(endDate.Ticks - startDate.Ticks);        switch (howtocompare.ToLower())        {          case "year":            diff = Convert.ToDouble(TS.TotalDays / 365);            break;          case "month":            diff = Convert.ToDouble((TS.TotalDays / 365) * 12);            break;          case "day":            diff = Convert.ToDouble(TS.TotalDays);            break;          case "hour":            diff = Convert.ToDouble(TS.TotalHours);            break;          case "minute":            diff = Convert.ToDouble(TS.TotalMinutes);            break;          case "second":            diff = Convert.ToDouble(TS.TotalSeconds);            break;        }      }      catch (Exception)      {        diff = 0;      }      return diff;    }    #endregion    #region 計算兩個日期之間相差的工作日天數    /// <summary>    /// 計算兩個日期之間相差的工作日天數    /// </summary>    /// <param name="dtStart">開始日期</param>    /// <param name="dtEnd">結束日期</param>    /// <param name="Flag">是否除去周六，周日</param>    /// <returns>Int</returns>    public static int CalculateWorkingDays(DateTime dtStart, DateTime dtEnd, bool Flag)    {      int count = 0;      for (DateTime dtTemp = dtStart; dtTemp < dtEnd; dtTemp = dtTemp.AddDays(1))      {        if (Flag)        {          if (dtTemp.DayOfWeek != DayOfWeek.Saturday && dtTemp.DayOfWeek != DayOfWeek.Sunday)          {            count++;          }        }        else        {          count++;        }      }      return count;    }    #endregion  }}