包括C#方法和SQL方法。
C#
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { Console.WriteLine("输入日期,并回车(0退出):"); string d1 = Console.ReadLine(); while (d1 != "0") { DateTime dt = Convert.ToDateTime(d1); List<MyDate> datelist = DateUtil.GetWeekOfMonth(dt); Console.WriteLine(dt.Year+"年"+dt.Month+"月包含【"+datelist.Count+"】周:"); foreach (var d in datelist) { Console.WriteLine(d.firstDate + "\t" + d.lastDate); } d1 = Console.ReadLine(); } } } class DateUtil{ #region 获取时间(周,月) public static DateTime GetWeekDateStart(DateTime? date) { DateTime currentdate = date.HasValue ? date.Value : DateTime.Now; //本周 int weeknow = Convert.ToInt32(currentdate.DayOfWeek); //星期日 获取weeknow为0 weeknow = weeknow == 0 ? 7 : weeknow; int daydiff = (-1) * weeknow + 1; //本周第一天 return currentdate.AddDays(daydiff); } public static DateTime GetWeekDateEnd(DateTime? date) { DateTime currentdate = date.HasValue ? date.Value : DateTime.Now; //本周 int weeknow = Convert.ToInt32(currentdate.DayOfWeek); //星期日 获取weeknow为0 weeknow = weeknow == 0 ? 7 : weeknow; int dayadd = 7 - weeknow; //本周最后一天 return currentdate.AddDays(dayadd); } public static DateTime GetMonthDateStart(DateTime? date) { DateTime currentdate = date.HasValue ? date.Value : DateTime.Now; //本月第一天时间 DateTime firstDate = currentdate.AddDays(-(currentdate.Day) + 1); return firstDate; } public static DateTime GetMonthDateEnd(DateTime? date) { DateTime currentdate = date.HasValue ? date.Value : DateTime.Now; DateTime dt = currentdate; //将本月月数+1 DateTime dt2 = dt.AddMonths(1); //本月最后一天时间 DateTime lastDate = dt2.AddDays(-(dt.Day)); return lastDate; } /// <summary> /// 获取月份内的周时间段 /// </summary> /// <param name="crdate">时间</param> /// <returns>当月周时间段</returns> public static List<MyDate> GetWeekOfMonth(DateTime? crdate) { List<MyDate> dateList = new List<MyDate>(); DateTime currentdate = crdate.HasValue ? crdate.Value : DateTime.Now; DateTime firstDayofMonth = GetMonthDateStart(currentdate); DateTime lastDayofMonth = GetMonthDateEnd(currentdate); DateTime Week1firstday = GetWeekDateStart(firstDayofMonth); Week1firstday = Week1firstday < firstDayofMonth ? firstDayofMonth : Week1firstday; //第一周 MyDate date1 = new MyDate(); date1.firstDate = Week1firstday; date1.lastDate = GetWeekDateEnd(firstDayofMonth); dateList.Add(date1); //第二周 MyDate date2 = new MyDate(); DateTime Week2firstday = Week1firstday.AddDays(7); date2.firstDate = GetWeekDateStart(Week2firstday); ; date2.lastDate = GetWeekDateEnd(Week2firstday); dateList.Add(date2); //第三周 MyDate date3 = new MyDate(); DateTime Week3firstday = Week2firstday.AddDays(7); date3.firstDate = GetWeekDateStart(Week3firstday); ; date3.lastDate = GetWeekDateEnd(Week3firstday); dateList.Add(date3); //第四周 MyDate date4 = new MyDate(); DateTime Week4firstday = Week3firstday.AddDays(7); if (Week4firstday > lastDayofMonth) { Week4firstday = lastDayofMonth; } date4.firstDate = GetWeekDateStart(Week4firstday); date4.lastDate = GetWeekDateEnd(Week4firstday); if (date4.firstDate > lastDayofMonth) { return dateList; } if (date4.lastDate >= lastDayofMonth) { date4.lastDate = lastDayofMonth; dateList.Add(date4); return dateList; } dateList.Add(date4); //第五周 MyDate date5 = new MyDate(); DateTime Week5firstday = Week4firstday.AddDays(7); if (Week5firstday > lastDayofMonth) { Week5firstday = lastDayofMonth; } date5.firstDate = GetWeekDateStart(Week5firstday); date5.lastDate = GetWeekDateEnd(Week5firstday); if (date5.firstDate > lastDayofMonth) { return dateList; } if (date5.lastDate >= lastDayofMonth) { date5.lastDate = lastDayofMonth; dateList.Add(date5); return dateList; } dateList.Add(date5); //第六周 MyDate date6 = new MyDate(); DateTime Week6firstday = Week5firstday.AddDays(7); if (Week6firstday > lastDayofMonth) { Week6firstday = lastDayofMonth; } date6.firstDate = GetWeekDateStart(Week6firstday); date6.lastDate = GetWeekDateEnd(Week6firstday); if (date6.firstDate > lastDayofMonth) { return dateList; } if (date6.lastDate >= lastDayofMonth) { date6.lastDate = lastDayofMonth; dateList.Add(date6); return dateList; } dateList.Add(date6); return dateList; } #endregion } class MyDate { public DateTime firstDate { get; set; } public DateTime lastDate { get; set; } } }
测试示例:
SQL
DECLARE @ym VARCHAR(7) SET @ym = ‘2013-12‘ SET datefirst 1 SELECT wk , MIN(d) d1 , MAX(d) d2 FROM ( SELECT DATEPART(wk, d) wk , d FROM ( SELECT DATEADD(D, number, @ym + ‘-01‘) d FROM master..spt_values WHERE type = ‘p‘ AND CONVERT(VARCHAR(7), DATEADD(D, number, @ym + ‘-01‘), 120) = @ym ) t ) t GROUP BY wk
测试示例:
另mark周几获取方法
public string Week() { string[] weekdays = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" }; string week = weekdays[Convert.ToInt32(DateTime.Now.DayOfWeek)]; return week; }
获取月份的周时间段
时间: 2024-11-06 03:44:44