Csharp: ChineseLunisolarCalendar class

/// <summary>
///參考互網資源
/// 中国萬年曆靜態查詢節日操作基類
/// 20120908 修改 塗聚文
/// 20121010 修改 塗聚文
/// 締友計算機信息技術有限公司
/// 捷為工作室
/// </summary>
public static class ChineseDate
{
/// <summary>
/// 中國農曆
/// </summary>
private static ChineseLunisolarCalendar china = new ChineseLunisolarCalendar();
/// <summary>
/// 公曆節日
/// </summary>
private static Hashtable gHoliday = new Hashtable();
/// <summary>
/// 農曆節日
/// </summary>
private static Hashtable nHoliday = new Hashtable();
/// <summary>
/// 月中周節日
/// </summary>
private static Hashtable weekHolidays = new Hashtable();
/// <summary>
/// 年中第幾日節日
/// </summary>
private static Hashtable inYearDayHolidays = new Hashtable();
/// <summary>
/// 指定日期節日
/// </summary>
private static Hashtable specifiedHolidays = new Hashtable();

/// <summary>
/// 結婚紀念日
/// </summary>
private static Hashtable weddingHolidays = new Hashtable();
/// <summary>
/// 結婚紀念日名稱
/// </summary>
private static Hashtable weddingNameList = new Hashtable();

private static int currentWeek = 0;//记录周数

/// <summary>
///
/// </summary>
private static string[] JQ = {
"小寒", "大寒", "立春", "雨水", "惊蛰", "春分", "清明", "谷雨", "立夏", "小满", "芒种", "夏至", "小暑", "大暑"
, "立秋", "处暑", "白露", "秋分", "寒露", "霜降", "立冬", "小雪", "大雪", "冬至"
};
/// <summary>
///
/// </summary>
private static int[] JQData = {
0, 21208, 42467, 63836, 85337, 107014, 128867, 150921, 173149, 195551, 218072,
240693, 263343, 285989, 308563, 331033, 353350, 375494, 397447, 419210, 440795,
462224, 483532, 504758
};
/// <summary>
///
/// </summary>
static ChineseDate()
{
//公历节日
gHoliday.Add("0101", "元旦");
gHoliday.Add("0114", "日记情人节(Diary Day) ");//Diary Day 日记情人节
gHoliday.Add("0202", "世界湿地日 ");
gHoliday.Add("0210", "国际气象节 ");
gHoliday.Add("0214", "圣瓦伦丁节(Valentine’s Day ),塗聚文 ");//Valentine’s Day 传统情人节

gHoliday.Add("0301", "国际海豹日 ");
gHoliday.Add("0303", "全国爱耳日 ");

gHoliday.Add("0305", "雷锋日 ");
gHoliday.Add("0308", "妇女节 ");
gHoliday.Add("0312", "植树节 ");
gHoliday.Add("0314", "白色情人节(White Day ),国际警察日 ");//White Day 白色情人节
gHoliday.Add("0315", "消费者权益日 ");
gHoliday.Add("0317", "中国国医节 国际航海日 ");
gHoliday.Add("0321", "世界森林日 消除种族歧视国际日 世界儿歌日 ");
gHoliday.Add("0322", "世界水日 ");
gHoliday.Add("0323", "世界气象日 ");
gHoliday.Add("0324", "世界防治结核病日 ");
gHoliday.Add("0325", "全国中小学生安全教育日 ");
gHoliday.Add("0330", "巴勒斯坦国土日 ");

gHoliday.Add("0401", "愚人节 全国爱国卫生运动月(四月) 税收宣传月(四月) ");
gHoliday.Add("0414", "黑色情人节(Black Day) ");//Black Day 黑色情人节
gHoliday.Add("0407", "世界卫生日 ");
gHoliday.Add("0422", "世界地球日 ");
gHoliday.Add("0423", "世界图书和版权日 ");
gHoliday.Add("0424", "亚非新闻工作者日 ");

gHoliday.Add("0501", "劳动节 ");
gHoliday.Add("0504", "青年节 ");
gHoliday.Add("0505", "碘缺乏病防治日 ");
gHoliday.Add("0508", "世界红十字日 ");
gHoliday.Add("0512", "国际护士节 ");
gHoliday.Add("0514", "玫瑰情人节(Yellow &Rose Day) ");//Yellow &Rose Day 玫瑰情人节
gHoliday.Add("0515", "国际家庭日 ");
gHoliday.Add("0517", "国际电信日 ");
gHoliday.Add("0518", "国际博物馆日 ");
gHoliday.Add("0519", "中国旅游日 ");
gHoliday.Add("0520", "全国学生营养日 中国旅游日 ");
gHoliday.Add("0523", "国际牛奶日 ");
gHoliday.Add("0531", "世界无烟日 ");

gHoliday.Add("0601", "国际儿童节 ");
gHoliday.Add("0605", "世界环境保护日 ");
gHoliday.Add("0606", "全国爱眼日 ");
gHoliday.Add("0614", "亲亲情人节(Kiss Day) ");//Kiss Day 亲亲情人节
gHoliday.Add("0617", "防治荒漠化和干旱日 ");
gHoliday.Add("0623", "国际奥林匹克日 ");
gHoliday.Add("0625", "全国土地日 ");
gHoliday.Add("0626", "国际禁毒日 ");

gHoliday.Add("0701", "建党节 香港回归纪念日 中共诞辰 世界建筑日 ");
gHoliday.Add("0702", "国际体育记者日 ");
gHoliday.Add("0707", "抗日战争纪念日 ");
gHoliday.Add("0711", "世界人口日 ");
gHoliday.Add("0714", "绿色情人节(Green Day) ");//Green Day 绿色情人节
gHoliday.Add("0730", "非洲妇女日 ");

gHoliday.Add("0801", "建军节 ");
gHoliday.Add("0808", "中国男子节(爸爸节) ");
gHoliday.Add("0814", "银色情人节(Silver Day) ");//Silver Day 银色情人节
gHoliday.Add("0815", "抗日战争胜利纪念 ");

gHoliday.Add("0908", "国际扫盲日 国际新闻工作者日 ");
gHoliday.Add("0909", "毛主席逝世纪念 ");
gHoliday.Add("0910", "教师节 ");
gHoliday.Add("0914", "相片情人节(Music &Photo Day) 世界清洁地球日 ");//Music &Photo Day 相片情人节
gHoliday.Add("0916", "国际臭氧层保护日 ");
gHoliday.Add("0918", "九·一八事变纪念日 ");
gHoliday.Add("0920", "国际爱牙日 ");
gHoliday.Add("0927", "世界旅游日 ");
gHoliday.Add("0928", "孔子诞辰 ");

gHoliday.Add("1001", "国庆节  世界音乐日 国际老人节 ");
gHoliday.Add("1004", "世界动物日 ");
gHoliday.Add("1006", "老人节 ");
gHoliday.Add("1008", "全国高血压日 世界视觉日 ");
gHoliday.Add("1009", "世界邮政日 万国邮联日 ");
gHoliday.Add("1010", "辛亥革命纪念日 世界精神卫生日 ");
gHoliday.Add("1013", "世界保健日 国际教师节 ");
gHoliday.Add("1014", "葡萄酒情人节(Wine Day) 世界标准日 ");//Wine Day 葡萄酒情人节
gHoliday.Add("1015", "国际盲人节(白手杖节) ");
gHoliday.Add("1016", "世界粮食日 ");
gHoliday.Add("1017", "世界消除贫困日 ");
gHoliday.Add("1022", "世界传统医药日 ");
gHoliday.Add("1024", "联合国日 ");
gHoliday.Add("1031", "世界勤俭日 ");

gHoliday.Add("1107", "十月社会主义革命纪念日 ");
gHoliday.Add("1108", "中国记者日 ");
gHoliday.Add("1109", "全国消防安全宣传教育日 ");
gHoliday.Add("1110", "世界青年节 ");
gHoliday.Add("1111", "国际科学与和平周(本日所属的一周) ");
gHoliday.Add("1112", "孙中山诞辰纪念日 ");
gHoliday.Add("1114", "电影情人节(Orange & Movie Day)  世界糖尿病日 ");//Orange & Movie Day 电影情人节
gHoliday.Add("1117", "国际大学生节 世界学生节 ");
gHoliday.Add("1120", "彝族年 ");
gHoliday.Add("1121", "彝族年 世界问候日 世界电视日 ");
gHoliday.Add("1122", "彝族年 ");
gHoliday.Add("1129", "国际声援巴勒斯坦人民国际日 ");

gHoliday.Add("1201", "世界艾滋病日 ");
gHoliday.Add("1203", "世界残疾人日 ");
gHoliday.Add("1205", "国际经济和社会发展志愿人员日 ");
gHoliday.Add("1208", "国际儿童电视日 ");
gHoliday.Add("1209", "世界足球日 ");
gHoliday.Add("1210", "世界人权日 ");
gHoliday.Add("1212", "西安事变纪念日 ");
gHoliday.Add("1213", "南京大屠杀(1937年)纪念日！紧记血泪史！ ");
gHoliday.Add("1214", "拥抱情人节(Hug Day) ");//Hug Day 拥抱情人节
gHoliday.Add("1220", "澳门回归纪念 ");
gHoliday.Add("1221", "国际篮球日 ");
gHoliday.Add("1224", "平安夜 ");
gHoliday.Add("1225", "圣诞节 ");
gHoliday.Add("1226", "毛主席诞辰纪念 ");

//农历节日(年份數據不正確,只做測試)
nHoliday.Add("0101", "0028春节");
nHoliday.Add("0115", "0026元宵节");
nHoliday.Add("0202", "0027龙抬头节");
nHoliday.Add("0505", "0021端午节");
nHoliday.Add("0707", "0820七夕(乞巧节)");//
nHoliday.Add("0715", "0020中元节(鬼节)");//
nHoliday.Add("0815", "0023中秋节");
nHoliday.Add("0909", "0026重阳节");
nHoliday.Add("1001", "0021寒衣节");
nHoliday.Add("1208", "0028腊八节");
nHoliday.Add("1223", "0120灶君(祭灶)节");//
nHoliday.Add("1224", "0220小年");
nHoliday.Add("1227", "1976塗聚文");

//周節日
weekHolidays.Add("050201", "1907母亲节Mother's Day");
weekHolidays.Add("050301", "1990全国助残日");
weekHolidays.Add("060301", "1910父亲节");
weekHolidays.Add("090303", "1981国际和平日");
weekHolidays.Add("090401", "1958国际聋人节");
weekHolidays.Add("100102", "1985国际住房日");
weekHolidays.Add("100104", "1987国际减轻自然灾害日");
weekHolidays.Add("110405", "1941感恩节Thanksgiving Day");
//weekHolidays.Add("", "");

//年中第幾日節日
inYearDayHolidays.Add("256", "2002程序员节(День программиста)");

//指定節日
specifiedHolidays.Add("20000423", "復活節(西欧)");
specifiedHolidays.Add("20000430", "復活節(东正教)");
specifiedHolidays.Add("20010415", "復活節");
specifiedHolidays.Add("20020331", "復活節(西歐)");
specifiedHolidays.Add("20020505", "復活節(東正教)");
specifiedHolidays.Add("20030420", "復活節(西歐)");
specifiedHolidays.Add("20030427", "復活節(東正教)");
specifiedHolidays.Add("20040411", "復活節");
specifiedHolidays.Add("20050327", "復活節(西歐)");
specifiedHolidays.Add("20050501", "復活節(東正教)");
specifiedHolidays.Add("20060416", "復活節(西歐)");
specifiedHolidays.Add("20060423", "復活節(東正教)");
specifiedHolidays.Add("20070408", "復活節");
specifiedHolidays.Add("20080323", "復活節(西歐)");
specifiedHolidays.Add("20080427", "復活節(東正教)");
specifiedHolidays.Add("20090412", "復活節(西歐)");
specifiedHolidays.Add("20090419", "復活節(東正教)");
specifiedHolidays.Add("20100404", "復活節");
specifiedHolidays.Add("20110424", "復活節");
specifiedHolidays.Add("20120408", "復活節(西歐)");
specifiedHolidays.Add("20120415", "復活節(東正教)");
specifiedHolidays.Add("20130331", "復活節(西歐)");
specifiedHolidays.Add("20130505", "復活節(東正教)");
specifiedHolidays.Add("20140420", "復活節");
specifiedHolidays.Add("20150405", "復活節(西歐)");
specifiedHolidays.Add("20150412", "復活節(東正教)");
specifiedHolidays.Add("20160327", "復活節(西歐)");
specifiedHolidays.Add("20160501", "復活節(東正教)");
specifiedHolidays.Add("20170416", "復活節");
specifiedHolidays.Add("20180401", "復活節(西歐)");
specifiedHolidays.Add("20190421", "復活節(西歐)");
specifiedHolidays.Add("20190428", "復活節(東正教)");
specifiedHolidays.Add("20200412", "復活節(西歐)");
specifiedHolidays.Add("20200419", "復活節(東正教)");
//specifiedHolidays.Add("", "");

//specifiedHolidays.Add("", "");
// 結婚紀念日名稱
weddingHolidays.Add("0928", "2002劉軍與天金");
weddingHolidays.Add("0115", "2003阿文與阿紅");

weddingNameList.Add(1, "紙婚(Paper Wedding)");
weddingNameList.Add(2, "布婚/棉布婚(Calico Wedding/Cotton Wedding)");
weddingNameList.Add(3, "羊布婚/皮婚(Muslim Wedding/Leather Wedding)");
weddingNameList.Add(4, "絲婚(Silk Wedding)");
weddingNameList.Add(5, "木婚(Wood Wedding)");
weddingNameList.Add(6, "鐵婚(Iron Wedding)");
weddingNameList.Add(7, "銅婚(Copper Wedding)");
weddingNameList.Add(8, "陶器婚(Pottery Wedding)");
weddingNameList.Add(9, "柳婚(Willow Wedding)");
weddingNameList.Add(10, "錫婚(Tin Wedding)");
weddingNameList.Add(11, "鋼婚(Steel Wedding)");
weddingNameList.Add(12, "鏈婚(Chain Wedding)");
weddingNameList.Add(13, "花邊婚(Lace Wedding)");
weddingNameList.Add(14, "象牙婚(Ivory Wedding)");
weddingNameList.Add(15, "水晶婚(Crystal Wedding)");
weddingNameList.Add(20, "搪瓷婚(China Wedding)");
weddingNameList.Add(25, "銀婚(Silver Wedding/Silver Jubilee)");
weddingNameList.Add(30, "珍珠婚(Pearl Wedding)");
weddingNameList.Add(35, "珊瑚婚/碧玉婚(Coral Wedding/Jade Wedding)");
weddingNameList.Add(40, "紅寶石婚(Ruby Wedding)");
weddingNameList.Add(45, "藍寶石婚(Sapphire Wedding)");
weddingNameList.Add(50, "金婚(Golden Wedding)");
weddingNameList.Add(55, "翡翠婚(Emerald Wedding)");
weddingNameList.Add(60, "鑽石婚(Diamond Wedding/Diamond Jubilee)");
}

/// <summary>
/// 获取农历
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetChinaDate(DateTime dt)
{
if (dt > china.MaxSupportedDateTime || dt < china.MinSupportedDateTime)
{
//日期范围：1901 年 2 月 19 日 - 2049 年 12 月 30 日
throw new Exception(string.Format("日期超出范围！必须在{0}到{1}之间！",
china.MinSupportedDateTime.ToString("yyyy-MM-dd"),
china.MaxSupportedDateTime.ToString("yyyy-MM-dd")));
}
string str = string.Format("{0} {1}{2}", GetYear(dt), GetMonth(dt), GetDay(dt));
string strJQ = GetSolarTerm(dt);
if (strJQ != "")
{
str += " (" + strJQ + ")";
}
string strHoliday = GetHoliday(dt);
if (strHoliday != "")
{
str += " " + strHoliday;
}
string strChinaHoliday = GetChinaHoliday(dt);
if (strChinaHoliday != "")
{
str += " " + strChinaHoliday;
}

return str;
}

/// <summary>
/// 获取农历年份
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetYear(DateTime dt)
{
int yearIndex = china.GetSexagenaryYear(dt);
string yearTG = " 甲乙丙丁戊己庚辛壬癸";
string yearDZ = " 子丑寅卯辰巳午未申酉戌亥";
string yearSX = " 鼠牛虎兔龙蛇马羊猴鸡狗猪";
int year = china.GetYear(dt);
int yTG = china.GetCelestialStem(yearIndex);
int yDZ = china.GetTerrestrialBranch(yearIndex);

string str = string.Format("[{1}]{2}{3}{0}", year, yearSX[yDZ], yearTG[yTG], yearDZ[yDZ]);
return str;
}

/// <summary>
/// 获取农历月份
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetMonth(DateTime dt)
{
int year = china.GetYear(dt);
int iMonth = china.GetMonth(dt);
int leapMonth = china.GetLeapMonth(year);
bool isLeapMonth = iMonth == leapMonth;
if (leapMonth != 0 && iMonth >= leapMonth)
{
iMonth--;
}

string szText = "正二三四五六七八九十";
string strMonth = isLeapMonth ? "闰" : "";
if (iMonth <= 10)
{
strMonth += szText.Substring(iMonth - 1, 1);
}
else if (iMonth == 11)
{
strMonth += "十一";
}
else
{
strMonth += "腊";
}
return strMonth + "月";
}
/// <summary>
/// 數字農曆月份
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static int GetMonthInt(DateTime dt)
{
int year = china.GetYear(dt);
int iMonth = china.GetMonth(dt);
//闰月
int leapMonth = china.GetLeapMonth(year);
bool isLeapMonth = iMonth == leapMonth;
if (leapMonth != 0 && iMonth >= leapMonth)
{
iMonth--;
}
return iMonth;
}

/// <summary>
/// 获取农历日期
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetDay(DateTime dt)
{
int iDay = china.GetDayOfMonth(dt);
string szText1 = "初十廿三";
string szText2 = "一二三四五六七八九十";
string strDay;
if (iDay == 20)
{
strDay = "二十";
}
else if (iDay == 30)
{
strDay = "三十";
}
else
{
strDay = szText1.Substring((iDay - 1) / 10, 1);
strDay = strDay + szText2.Substring((iDay - 1) % 10, 1);
}
return strDay;
}

/// <summary>
/// 获取节气
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetSolarTerm(DateTime dt)
{
DateTime dtBase = new DateTime(1900, 1, 6, 2, 5, 0);
DateTime dtNew;
double num;
int y;
string strReturn = "";

y = dt.Year;
for (int i = 1; i <= 24; i++)
{
num = 525948.76 * (y - 1900) + JQData[i - 1];
dtNew = dtBase.AddMinutes(num);
if (dtNew.DayOfYear == dt.DayOfYear)
{
strReturn = JQ[i - 1];
}
}

return strReturn;
}

/// <summary>
/// 获取公历节日
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetHoliday(DateTime dt)
{
//int y = dt.Year;
string strReturn = "";
//int sy = 0;
object g = gHoliday[dt.Month.ToString("00") + dt.Day.ToString("00")];
if (g != null)
{
strReturn = g.ToString();

}

return strReturn;
}

/// <summary>
/// 获取农历节日 並獲取周年
/// 塗聚文
/// </summary>
/// <param name="dt">公曆時間</param>
/// <returns>返回節日名稱和周年</returns>
public static string GetChinaHoliday(DateTime dt)
{
string strReturn = "";
int year = china.GetYear(dt);
int iMonth = china.GetMonth(dt);
int leapMonth = china.GetLeapMonth(year);
int iDay = china.GetDayOfMonth(dt);
int sy = 0;

if (china.GetDayOfYear(dt) == china.GetDaysInYear(year))
{
strReturn = "除夕";
}
else if (leapMonth != iMonth)
{
if (leapMonth != 0 && iMonth >= leapMonth)
{
iMonth--;
}
object n = nHoliday[iMonth.ToString("00") + iDay.ToString("00")];

if (n != null)
{
if (strReturn == "")
{
strReturn = n.ToString();
sy = year - int.Parse(strReturn.Substring(0, 4)); //取前面四位得到年份，並以在此年份這後顯示節日
if (sy >= 0)
{
strReturn = strReturn.Substring(4, strReturn.Length - 4) + "〖" + sy.ToString() + "周年〗";
}
else
{
strReturn = "";
}
}
else
{
strReturn += " " + n.ToString();
}
}
}

return strReturn;
}
/// <summary>
/// 周期性節日
/// </summary>
/// <param name="dt">公曆時間</param>
/// <returns>返回節日名稱和周年</returns>
public static string GetWeekHoliday(DateTime dt)
{
int y = dt.Year;
string strReturn = "";
int sy = 0;
int weeks = week(dt); //第幾周
int weekday = ConvertDayOfWeek(dt.DayOfWeek);//周幾

object g = weekHolidays[dt.Month.ToString("00") + weeks.ToString("00")+weekday.ToString("00")];
if (g != null)
{
strReturn = g.ToString();
sy = y - int.Parse(strReturn.Substring(0, 4)); //取前面四位得到年份
if (sy >= 0) //必須之後的年份才可以顯示
{
strReturn = strReturn.Substring(4, strReturn.Length - 4) + "〖" + sy.ToString() + "周年〗";

}
else
{
strReturn = string.Empty;

}

}
return strReturn;

}
/// <summary>
///年中第幾日節日 程序員節
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetInYearMonth(DateTime dt)
{
int y = dt.Year;
int sy = 0;
string strReturn = "";
int inyear = dt.DayOfYear;
object g = inYearDayHolidays[inyear.ToString("000")];
if (g != null)
{
strReturn = g.ToString();
sy = y - int.Parse(strReturn.Substring(0, 4)); //取前面四位得到年份
if (sy >= 0) //必須之後的年份才可以顯示
{
strReturn = strReturn.Substring(4, strReturn.Length - 4) + "〖" + sy.ToString() + "周年〗";

}
else
{
strReturn = string.Empty;

}
}
return strReturn;

}
/// <summary>
/// 指定的節日
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetSpecifiedDay(DateTime dt)
{
string strReturn = "";
object g = specifiedHolidays[dt.Year.ToString("0000") + dt.Month.ToString("00") + dt.Day.ToString("00")];
if (g != null)
{
strReturn = g.ToString();
}
return strReturn;

}

/// <summary>
/// 結婚紀念日
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string GetWeddingHoliday(DateTime dt)
{
int y = dt.Year;
int sy = 0;
string strReturn = "";
string nameRetur = string.Empty;
object g = weddingHolidays[dt.Month.ToString("00") + dt.Day.ToString("00")];
if (g != null)
{
strReturn = g.ToString();

sy = y - int.Parse(strReturn.Substring(0, 4)); //取前面四位得到年份
if (sy >= 0) //必須之後的年份才可以顯示
{
strReturn = strReturn.Substring(4, strReturn.Length - 4);
object name = weddingNameList[sy];
if (name != null)
{
nameRetur = "〖" + name.ToString() + "紀念〗";
}
else
{
nameRetur = "〖" + sy.ToString() + "周年結婚紀念〗";
}
}
else
{
strReturn = "";
}
}
return strReturn + nameRetur;

}
/// <summary>
/// 将星期几转成数字表示
/// </summary>
/// <param name="dayOfWeek"></param>
/// <returns></returns>
private static int ConvertDayOfWeek(DayOfWeek dayOfWeek)
{
switch (dayOfWeek)
{
case DayOfWeek.Sunday:
return 1;
case DayOfWeek.Monday:
return 2;
case DayOfWeek.Tuesday:
return 3;
case DayOfWeek.Wednesday:
return 4;
case DayOfWeek.Thursday:
return 5;
case DayOfWeek.Friday:
return 6;
case DayOfWeek.Saturday:
return 7;
default:
return 0;
}
}
/// <summary>
/// 当前日期是本月的第几周
/// </summary>
/// <param name="day"></param>
/// <returns></returns>
private static int week(DateTime day)
{

string y = day.Year.ToString();
string m = day.Month.ToString();
string s = y + "-" + m + "-1";

DateTime dt = DateTime.Parse(s);

int d = day.Day - dt.Day;
int w = 1;
for (int i = 1; i <= d; i++)
{

DateTime dt1 = dt.AddDays(i);
if (dt1.DayOfWeek == DayOfWeek.Sunday)
{
w = w + 1;
}

}

return w;
}

}