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，必須大於1800年1月1日 /// <summary> /// 判斷是否為合法日期，必須大於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 分鍾 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 } }
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