public static bool IsRoshChodesh(JewishDate date)
{
//Rosh Hashana isn't considered a Rosh Chodesh
if (date.Day == 30 || (date.Day == 1 && date.Month != (int)Months.Tishrei))
{
return(true);
}
return(false);
}
/// <summary>
/// Returns the first occurrence of the specified <see cref="System.DayOfWeek"/> after the <see cref="JewishDate"/>.
/// If the <see cref="JewishDate"/> falls on the specified <see cref="System.DayOfWeek"/> then no days are added.
/// </summary>
/// <param name="day">The day of the week to search for</param>
/// <returns>The <see cref="JewishDate"/> that matches the <paramref name="day"/>, could be the original <see cref="JewishDate"/></returns>
public JewishDate FindNextDay(DayOfWeek day)
{
JewishDate result = this;
while (result.DayOfWeek != day)
{
result = result.Add(new TimeSpan(1, 0, 0, 0));
}
return(result);
}
public static IList <SpecialDates> GetDayInfo(JewishDate date, bool inIsrael)
{
IList <SpecialDates> specialDates = new List <SpecialDates>();
int year = date.Year;
int month = date.Month;
int day = date.Day;
bool isShabbos = IsShabbos(date);
bool isYesterdayShabbos = IsYesterdayShabbos(date);
bool isCheshvanShort = IsCheshvanShort(year);
bool isKislevLong = IsKislevLong(year);
bool isLeapYear = IsLeapYear(year);
if (!isLeapYear && month > 6)
{
//This is to keep it in-line with the enum Months. If it is a leap year Nissan = 7, if it isn't it's 6. This lines them up
month++;
}
switch ((Months)month)
{
case Months.Tishrei:
if (day == 1 || day == 2)
{
specialDates.Add(SpecialDates.RoshHashana);
}
else if ((day == 3 && !isShabbos) || (day == 4 && isYesterdayShabbos))
{
specialDates.Add(SpecialDates.FastOfGedalia);
}
else if (day == 10)
{
specialDates.Add(SpecialDates.YomKippur);
}
else if ((day > 14 && day < 22))
{
specialDates.Add(SpecialDates.Sukkos);
}
else if (day == 22 && !inIsrael)
{
specialDates.Add(SpecialDates.ShminiAtzeres);
}
else if ((day == 22 && inIsrael) || (day == 23 && !inIsrael))
{
specialDates.Add(SpecialDates.SimchasTorah);
}
break;
case Months.Cheshvan:
break;
case Months.Kislev:
if (day > 24)
{
specialDates.Add(SpecialDates.Chanukah);
}
break;
case Months.Teves:
if (day < 3 || (day == 3 && !isKislevLong))
{
specialDates.Add(SpecialDates.Chanukah);
}
else if (day == 10)
{
specialDates.Add(SpecialDates.TenthOfTeves);
}
break;
case Months.Shvat:
if (day == 15)
{
specialDates.Add(SpecialDates.TuBishvat);
}
break;
case Months.AdarI:
if (!isLeapYear)
{
if ((day == 11 && IsShabbos(date.Add(new TimeSpan(2, 0, 0, 0)))) || (day == 13 && !isShabbos))
{
specialDates.Add(SpecialDates.FastOfEsther);
}
else if (day == 14)
{
specialDates.Add(SpecialDates.Purim);
}
else if (day == 15)
{
specialDates.Add(SpecialDates.ShushanPurim);
}
}
else
{
if (day == 14)
{
specialDates.Add(SpecialDates.PurimKatan);
}
}
break;
case Months.AdarII:
if ((day == 11 && IsShabbos(date.Add(new TimeSpan(2, 0, 0, 0)))) || (day == 13 && !isShabbos))
{
specialDates.Add(SpecialDates.FastOfEsther);
}
else if (day == 14)
{
specialDates.Add(SpecialDates.Purim);
}
else if (day == 15)
{
specialDates.Add(SpecialDates.ShushanPurim);
}
break;
case Months.Nissan:
if ((day == 14 && !isShabbos) || (day == 12 && IsShabbos(date.Add(new TimeSpan(2, 0, 0, 0)))))
{
specialDates.Add(SpecialDates.FastOfTheFirstborn);
}
else if ((day > 14 && day < 22) || (day == 22 && !inIsrael))
{
specialDates.Add(SpecialDates.Pesach);
}
break;
case Months.Iyar:
if (day == 14)
{
specialDates.Add(SpecialDates.PesachSheni);
}
else if (day == 18)
{
specialDates.Add(SpecialDates.LagBaomer);
}
break;
case Months.Sivan:
if (day == 6 || (day == 7 && !inIsrael))
{
specialDates.Add(SpecialDates.Shovuos);
}
break;
case Months.Tamuz:
if ((day == 17 && !isShabbos) || (day == 18 && isYesterdayShabbos))
{
specialDates.Add(SpecialDates.SeventeenthOfTamuz);
}
break;
case Months.Av:
if ((day == 9 && !isShabbos) || (day == 10 && isYesterdayShabbos))
{
specialDates.Add(SpecialDates.NinthOfAv);
}
else if (day == 15)
{
specialDates.Add(SpecialDates.TuBeAv);
}
break;
case Months.Elul:
break;
default:
throw new ArgumentOutOfRangeException(nameof(month), month, null);
}
//Check if Rosh Chodesh
if (IsRoshChodesh(date))
{
specialDates.Add(SpecialDates.RoshChodesh);
}
return(specialDates);
}
/// <summary>
/// Returns what day of the week the first day of Pesach falls on, used to calculate the parshios
/// </summary>
/// <param name="Date">A date within the respective year, doesn't have to be Pesach</param>
/// <returns>The day of the week that first day of Pesach falls on</returns>
public static DayOfWeek GetPesachDayOfWeek(JewishDate Date)
{
HebrewCalendar hebCal = new HebrewCalendar();
return(hebCal.GetDayOfWeek(new JewishDate(Date.Year, IsLeapYear(Date) ? 8 : 7, 15)));
}
/// <summary>
/// Returns what day of the week Rosh Hashanah of that year fell on.
/// </summary>
/// <param name="Date">A date within the respective year, doesn't have to be Rosh Hashanah</param>
/// <returns>The day of the week that Rosh Hashanah fell on</returns>
public static DayOfWeek GetRHDayOfWeek(JewishDate Date)
{
return(GetRHDayOfWeek(Date.Year));
}
public static bool IsYesterdayShabbos(JewishDate date)
{
return(IsShabbos(date.Subtract(new TimeSpan(1, 0, 0, 0))));
}
public static bool IsShabbos(JewishDate date)
{
return(date.DayOfWeek == DayOfWeek.Saturday);
}
public static bool IsLeapYear(JewishDate date)
{
return(IsLeapYear(date.Year));
}