293 lines
12 KiB
C#
293 lines
12 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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namespace BLL
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{
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/// <summary>
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/// .net时间操作（星期-周）
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/// </summary>
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public class WeekDayService
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{
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/// <summary>
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/// 取指定日期是一年中的第几周
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/// </summary>
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/// <param name="dtime">给定的日期</param>
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/// <returns>数字 一年中的第几周</returns>
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public static int WeekOfYear(DateTime dtime)
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{
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try
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{
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//确定此时间在一年中的位置
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int dayOfYear = dtime.DayOfYear;
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//当年第一天
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DateTime tempDate = new DateTime(dtime.Year, 1, 1);
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//确定当年第一天
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int tempDayOfWeek = (int)tempDate.DayOfWeek;
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tempDayOfWeek = tempDayOfWeek == 0 ? 7 : tempDayOfWeek;
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////确定星期几
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int index = (int)dtime.DayOfWeek;
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index = index == 0 ? 7 : index;
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//当前周的范围
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DateTime retStartDay = dtime.AddDays(-(index - 1));
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DateTime retEndDay = dtime.AddDays( - index);
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//确定当前是第几周
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int weekIndex = (int)Math.Ceiling(((double)dayOfYear + tempDayOfWeek - 1) / 7);
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if (retStartDay.Year<retEndDay.Year)
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{
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weekIndex = 1;
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}
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return weekIndex;
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}
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catch (Exception ex)
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{
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throw new Exception(ex.Message);
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}
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}
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/// <summary>
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/// 求某年有多少周
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/// </summary>
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/// <param name="dtime"></param>
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/// <returns></returns>
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public static int GetWeekOfYear(DateTime dtime)
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{
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int countDay = DateTime.Parse(dtime.Year + "--").DayOfYear;
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int countWeek = countDay / 7;
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return countWeek;
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}
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//根据年月日获得星期几
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public static int CaculateWeekDay(DateTime? date)
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{
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int week = 0;
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if (date.HasValue)
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{
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int year = date.Value.Year;
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int month = date.Value.Month;
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int day = date.Value.Day;
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//把一月和二月看成是上一年的十三月和十四月
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if (month == 1) { month = 13; year--; }
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if (month == 2) { month = 14; year--; }
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week = (day + 2 * month + 3 * (month + 1) / 5 + year + year / 4 - year / 100 + year / 400) % 7;
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}
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return week + 1;
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}
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//根据年月日获得星期几
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public static string CaculateWeekDayT(DateTime? date)
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{
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string weekStr = "星期";
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int week = CaculateWeekDay(date);
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if (week == 1)
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{
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weekStr += "一";
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}
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else if (week == 2)
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{
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weekStr += "二";
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}
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else if (week == 3)
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{
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weekStr += "三";
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}
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else if (week == 4)
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{
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weekStr += "四";
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}
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else if (week == 5)
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{
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weekStr += "五";
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}
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else if (week == 6)
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{
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weekStr += "六";
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}
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else if (week == 7)
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{
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weekStr += "日";
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}
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return weekStr;
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}
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/// <summary>
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/// 根据2个时间段获得相应的周数
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/// </summary>
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/// <param name="beginDate"></param>
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/// <param name="endDate"></param>
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/// <returns></returns>
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public static int WeekOfDate(DateTime beginDate, DateTime endDate)
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{
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TimeSpan ts1 = new TimeSpan(beginDate.Ticks);
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TimeSpan ts2 = new TimeSpan(endDate.Ticks);
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TimeSpan ts = ts2.Subtract(ts1).Duration();
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int weeks = ts.Days / 7;
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//确定此时间在一年中的位置
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int dayOfYear = beginDate.DayOfYear;
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//当年第一天
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DateTime tempDate = new DateTime(beginDate.Year, beginDate.Month, beginDate.Day);
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//最后一天
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DateTime tempendDate = new DateTime(endDate.Year, endDate.Month, endDate.Day);
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int tempDayOfWeek = (int)tempDate.DayOfWeek;
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tempDayOfWeek = tempDayOfWeek == 0 ? 7: tempDayOfWeek;
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////确定星期几
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int startindex = (int)beginDate.DayOfWeek;
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startindex = startindex == 0 ? 7 : startindex;
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//当前周的范围
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DateTime retStartDay = beginDate.AddDays(-(startindex - 1));
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DateTime retEndDay = beginDate.AddDays(7 - startindex);
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//确定当前是第几周
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int weekIndex = (int)Math.Ceiling(((double)dayOfYear + tempDayOfWeek - 1) / 7);
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return weeks;
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}
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/// <summary>
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/// 根据起始时间，获取第几周
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/// </summary>
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/// <param name="dtime">当前时间</param>
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/// <returns></returns>
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public static int WeekOfTermDate(DateTime dtime)
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{
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string datetime = "2011-3-1";
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TimeSpan ts1 = new TimeSpan(dtime.Ticks);
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TimeSpan ts2 = new TimeSpan(Convert.ToDateTime(datetime).Ticks);
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TimeSpan ts = ts2.Subtract(ts1).Duration();
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//确定此时间在一年中的位置
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int dayOfYear = ts.Days;
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//当年第一天
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DateTime tempDate = new DateTime(Convert.ToDateTime(datetime).Year, Convert.ToDateTime(datetime).Month, Convert.ToDateTime(datetime).Day);
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int tempDayOfWeek = (int)tempDate.DayOfWeek;
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tempDayOfWeek = tempDayOfWeek == 0 ? 7 :tempDayOfWeek;
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////确定星期几
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int index = (int)dtime.DayOfWeek;
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index = index == 0 ? 7 :index;
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//当前周的范围
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DateTime retStartDay = dtime.AddDays(-(index - 1));
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DateTime retEndDay = dtime.AddDays(7 - index);
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//确定当前是第几周
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int weekIndex = (int)Math.Ceiling(((double)dayOfYear + tempDayOfWeek) / 7);
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return weekIndex;
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}
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/// <summary>
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/// 根据周，星期获得具体年月日
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/// </summary>
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/// <param name="week">第几周</param>
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/// <param name="day">星期几</param>
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/// <returns></returns>
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public static DateTime DateTimeByWeekAndDay(int week, int day)
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{
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DateTime someTime = Convert.ToDateTime("2011-3-1");
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int i = someTime.DayOfWeek - DayOfWeek.Monday;
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if (i == -1) i = 6;// i值 > = 0 ，因为枚举原因，Sunday排在最前，此时Sunday-Monday=-1，必须+7=6。
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TimeSpan ts = new TimeSpan(i, 0, 0, 0);
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//获取第N周的星期一
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someTime = someTime.Subtract(ts).AddDays((week - 1) * 7);
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//获得星期几
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someTime = someTime.AddDays(day - 1);
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return someTime;
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}
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/// <summary>
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/// 获取一年中指定的一周的开始日期和结束日期。开始日期遵循ISO 8601即星期一。
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/// </summary>
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/// <param name="year">年（1 到 9999）</param>
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/// <param name="weeks">周（1 到 53）</param>
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/// <param name="weekrule">确定首周的规则</param>
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/// <param name="first">当此方法返回时，则包含参数 year 和 weeks 指定的周的开始日期的 System.DateTime 值；如果失败，则为 System.DateTime.MinValue。如果参数 year 或 weeks 超出有效范围，则操作失败。该参数未经初始化即被传递。</param>
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/// <param name="last">当此方法返回时，则包含参数 year 和 weeks 指定的周的结束日期的 System.DateTime 值；如果失败，则为 System.DateTime.MinValue。如果参数 year 或 weeks 超出有效范围，则操作失败。该参数未经初始化即被传递。</param>
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/// <returns>成功返回 true，否则为 false。</returns>
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public static bool GetDaysOfWeeks(int year, int weeks, CalendarWeekRule weekrule, out DateTime first, out DateTime last)
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{
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//初始化 out 参数
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first = DateTime.MinValue;
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last = DateTime.MinValue;
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//不用解释了吧...
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if (year< 1 | year> 9999)
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return false;
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//一年最多53周地球人都知道...
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if (weeks< 1 | weeks> 53)
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return false;
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//取当年首日为基准...为什么？容易得呗...
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DateTime firstCurr = new DateTime(year, 1, 1);
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//取下一年首日用于计算...
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DateTime firstNext = new DateTime(year + 1, 1, 1);
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//将当年首日星期几转换为数字...星期日特别处理...ISO 8601 标准...
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int dayOfWeekFirst = (int)firstCurr.DayOfWeek;
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if (dayOfWeekFirst == 0) dayOfWeekFirst = 7;
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//得到未经验证的周首日...
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first = firstCurr.AddDays((weeks - 1) * 7 - dayOfWeekFirst + 1);
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//周首日是上一年日期的情况...
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if (first.Year<year)
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{
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switch (weekrule)
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{
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case CalendarWeekRule.FirstDay:
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//不用解释了吧...
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first = firstCurr;
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break;
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case CalendarWeekRule.FirstFullWeek:
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//顺延一周...
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first = first.AddDays(7);
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break;
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case CalendarWeekRule.FirstFourDayWeek:
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//周首日距年首日不足4天则顺延一周...
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if (firstCurr.Subtract(first).Days > 3)
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{
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first = first.AddDays(7);
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}
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break;
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default:
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break;
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}
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}
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//得到未经验证的周末日...
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last = first.AddDays(7).AddSeconds(-1);
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switch (weekrule)
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{
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case CalendarWeekRule.FirstDay:
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//周末日是下一年日期的情况...
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if (last.Year > year)
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last = firstNext.AddSeconds(-1);
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else if (last.DayOfWeek != DayOfWeek.Monday)
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last = first.AddDays(7 - (int) first.DayOfWeek).AddSeconds(-1);
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break;
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case CalendarWeekRule.FirstFourDayWeek:
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//周末日距下一年首日不足4天则提前一周...
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if (last.Year > year && firstNext.Subtract(first).Days< 4)
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{
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first = first.AddDays(-7);
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last = last.AddDays(-7);
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}
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break;
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default:
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break;
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}
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return true;
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}
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}
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}
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