using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Web;
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namespace WebAPI.Models
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{
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public class GetWeekList
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{
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#region 根据时间获取当前是第几周
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//如果12月31号与下一年的1月1好在同一个星期则算下一年的第一周
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public int GetWeekIndex(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(第多少天)
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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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//确定当年第一天是周几
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int tempDayOfWeek = (int)tempDate.DayOfWeek;
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//判断当前一月一号如果是周日(0),则默认为周一
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tempDayOfWeek = tempDayOfWeek == 0 ? 1 : tempDayOfWeek;
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//确定当前日期是星期几
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int index = (int)dTime.DayOfWeek;
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//判断当前日期如果是周日(0),则默认为周一
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index = index == 0 ? 1 : index;
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//当前日期周的范围
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DateTime retStartDay = dTime.AddDays(-(index - 1));
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DateTime retEndDay = dTime.AddDays(7 - index);
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//确定当前日期是第几周
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int weekIndex = (int)Math.Ceiling(((double)dayOfYear + tempDayOfWeek - 1) / 7);
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//对比当前日期周的开始和结束，判定是否跨年第一周
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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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//string retVal = retStartDay.ToString("yyyy/MM/dd") + "～" + retEndDay.ToString("yyyy/MM/dd");
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}
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public int GetWeekIndex(string strDate)
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{
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try
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{
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//需要判断的时间
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DateTime dTime = Convert.ToDateTime(strDate);
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return GetWeekIndex(dTime);
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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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#endregion
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#region 以周末为每周第一天来计算当前日期所属哪一年第几周
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public string getWeek(DateTime dtime)
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{
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int nowweekindex = 0;
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//定义每周第一天为周末开始
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int[] aweek = new int[] { 0, 1, 2, 3, 4, 5, 6 };
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int weekd = 0;
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string yearmonthweek = "";
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//确定此时间在一年中的位置(第多少天)
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int dayofyear = dtime.DayOfYear;
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//确定此时间在一年中的月份
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int dayofmonth = dtime.Month;
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//确定当年第一天是周几
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//int dayofweek = (int)dtime.DayOfWeek;
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//当年第一天
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DateTime dtfirstday = new DateTime(dtime.Year, 1, 1);
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//确定当年第一天是周几
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int dtfirstdayofweek = (int)dtfirstday.DayOfWeek;
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//DateTime dtlastday = new DateTime(dtime.Year, 12, 31);
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//下一年第一天
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DateTime dtnextyear = new DateTime(dtime.Year + 1, 1, 1);
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//int dtnextyeardayofweek = (int)dtnextyear.DayOfWeek;
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//下一年第一天是周几
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int nextyear = sy(dtnextyear,aweek) - 1;
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DateTime dtlastday1 = new DateTime(dtime.Year, 12, 31 - nextyear);
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if ((int)dtime.DayOfYear - (int)dtfirstday.DayOfYear <= 7 - sy(dtfirstday,aweek))
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{
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nowweekindex = 1;
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yearmonthweek = dtime.Year + "_" + dayofmonth + "_" + nowweekindex;
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}
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else if ((int)dtime.DayOfYear <= (int)dtlastday1.DayOfYear)
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{
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for (int j = 0; j < aweek.Length; j++)
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{
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if (Convert.ToInt32(aweek[j]) == dtfirstdayofweek)
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{
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int b = aweek.Length - (j + 1);
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int x = (dayofyear - 1) - b;
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weekd = x / 7;
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int yushu = x % 7;
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if (yushu != 0)
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{
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nowweekindex = weekd + 2;
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yearmonthweek = dtime.Year + "_" + dayofmonth + "_" + nowweekindex;
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}
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else
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{
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nowweekindex = weekd + 1;
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yearmonthweek = dtime.Year + "_" + dayofmonth + "_" + nowweekindex;
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}
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}
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}
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}
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else
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{
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nowweekindex = weekd + 1;
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yearmonthweek = dtime.Year + 1 + "_" + 1 + "_" + nowweekindex;
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}
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return yearmonthweek;
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}
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public static int sy(DateTime dtime, int[] aweek)
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{
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int midnum = 0;
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int midof = (int)dtime.DayOfWeek;
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for (int i = 0; i < aweek.Length; i++)
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{
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if (Convert.ToInt32(aweek[i]) == midof)
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{
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midnum = i;
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}
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}
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return midnum + 1;
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}
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#endregion
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public string GetCodeDateStr(DateTime dtime)
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{
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DateTime currentTime = dtime;
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var year = GetOfYear(currentTime);
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var week = GetWeekOfYear(currentTime);
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var weekStr = week < 10 ? $"0{week}" : week.ToString();
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var dateStr = $"{year}{weekStr}{getWeekOfDay(dtime)}"; ;
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return dateStr;
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}
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private static int GetOfYear(DateTime dt)
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{
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var OfYear =int.Parse(dt.Year.ToString().ToCharArray()[3].ToString());
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GregorianCalendar gc = new GregorianCalendar();
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//判断当前日期是否是12月份
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int dayofmonth = dt.Month;
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//判断当前日期是第几周
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int dayofweek = gc.GetWeekOfYear(dt, CalendarWeekRule.FirstDay, DayOfWeek.Sunday);
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//下一年的第一天
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DateTime dtfirstday = new DateTime(dt.Year + 1, 1, 1);
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//确定下一年第一天是周几
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int dtfirstdayofweek = (int)dtfirstday.DayOfWeek;
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//判断下一年第一天不为周日且当前日期为本年第12月且当前日期为本年第53周
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if (dtfirstdayofweek != 0 && dayofmonth == 12 && dayofweek == 53)
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{
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OfYear = OfYear + 1; //加一年
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}
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else
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{
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OfYear = int.Parse(dt.Year.ToString().ToCharArray()[3].ToString());
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}
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return OfYear;
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}
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private static int GetWeekOfYear(DateTime dt)
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{
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int weekOfYear = 1;
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GregorianCalendar gc = new GregorianCalendar();
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//判断当前日期是否是12月份
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int dayofmonth = dt.Month;
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//判断当前日期是第几周
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int dayofweek=gc.GetWeekOfYear(dt, CalendarWeekRule.FirstDay, DayOfWeek.Sunday);
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//下一年的第一天
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DateTime dtfirstday = new DateTime(dt.Year+1, 1, 1);
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//确定下一年第一天是周几
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int dtfirstdayofweek = (int)dtfirstday.DayOfWeek;
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//判断下一年第一天不为周日且当前日期为本年第12月且当前日期为本年第53周
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if (dtfirstdayofweek != 0&& dayofmonth == 12&&dayofweek ==53)
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{
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weekOfYear = 1; //下一年第一周
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}
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else
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{
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weekOfYear = gc.GetWeekOfYear(dt, CalendarWeekRule.FirstDay, DayOfWeek.Sunday);
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}
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return weekOfYear;
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}
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public static int getWeekOfDay(DateTime dtime)
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{
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int DayinWeek = 0;
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string week = dtime.DayOfWeek.ToString();
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switch (week)
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{
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case "Monday":
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DayinWeek = 2;
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break;
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case "Tuesday":
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DayinWeek = 3;
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break;
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case "Wednesday":
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DayinWeek = 4;
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break;
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case "Thursday":
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DayinWeek = 5;
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break;
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case "Friday":
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DayinWeek = 6;
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break;
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case "Saturday":
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DayinWeek = 7;
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break;
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case "Sunday":
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DayinWeek = 1;
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break;
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}
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return DayinWeek;
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}
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}
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}
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