/// <summary> /// 判斷兩個日期是否在同一周 /// </summary> /// <param name="dtmS">開始日期</param> /// <param name="dtmE">結束日期</param> /// <returns></returns> private bool IsInSameWeek(DateTime dtmS, DateTime dtmE) { TimeSpan ts = dtmE - dtmS; double dbl = ts.TotalDays; int intDow = Convert.ToInt32(dtmE.DayOfWeek); if (intDow == 0) intDow = 7; if (dbl >= 7 || dbl >= intDow) return false; else return true; } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | /// <summary> /// 某日期是本月的第幾周 /// </summary> /// <param name="dtSel"></param> /// <param name="sundayStart"></param> /// <returns></returns> private int WeekOfMonth(DateTime dtSel, bool sundayStart) { //如果要判斷的日期爲1號，則肯定是第一週了 if (dtSel.Day == 1) return 1; else { //得到本月第一天 DateTime dtStart = new DateTime (dtSel.Year, dtSel.Month, 1); //得到本月第一天是周幾 int dayofweek = (int)dtStart.DayOfWeek; //如果不是以週日開始，需要重新計算一下 //dayofweek，詳細風DayOfWeek枚舉的定義 if (!sundayStart) { dayofweek = dayofweek - 1; if (dayofweek < 0) dayofweek = 7; } //得到本月的第一週一共有幾天 int startWeekDays = 7 - dayofweek; //如果要判斷的日期在第一週範圍內，返回1 if (dtSel.Day <= startWeekDays) return 1; else { int aday = dtSel.Day + 7 - startWeekDays; return aday / 7 + (aday % 7 > 0 ? 1 : 0); } } } |