isYomTov() now returns true for 20 Nissan

Thanks Shai for catching this 11 year old bug.

src/main/java/com/kosherjava/zmanim/hebrewcalendar/JewishCalendar.java

@@ -1,6 +1,6 @@
 /*
  * Zmanim Java API
- * Copyright (C) 2011 - 2023 Eliyahu Hershfeld
+ * Copyright (C) 2011 - 2024 Eliyahu Hershfeld
  * Copyright (C) September 2002 Avrom Finkelstien
  * Copyright (C) 2019 - 2022 Y Paritcher
  *
@@ -26,7 +26,7 @@
 
 /**
  * The JewishCalendar extends the JewishDate class and adds calendar methods.
- * <p>
+ * 
  * This open source Java code was originally ported by <a href="http://www.facebook.com/avromf">Avrom Finkelstien</a>
  * from his C++ code. It was refactored to fit the KosherJava Zmanim API with simplification of the code, enhancements
  * and some bug fixing. The class allows setting whether the holiday and <em>parsha</em> scheme follows the Israel scheme
@@ -42,7 +42,7 @@
  * @see java.util.Calendar
  * @author &copy; Y. Paritcher 2019 - 2022
  * @author &copy; Avrom Finkelstien 2002
- * @author &copy; Eliyahu Hershfeld 2011 - 2023
+ * @author &copy; Eliyahu Hershfeld 2011 - 2024
  */
 public class JewishCalendar extends JewishDate {
 	/** The 14th day of Nissan, the day before Pesach (Passover).*/
@@ -387,9 +387,8 @@ public boolean isBirkasHachamah() {
 		 * Rosh Hashana as 1, we have to add 1 day for a total of 171. To this add a day since the tekufah is on a Tuesday
 		 * night, and we push off the bracha to Wednesday morning resulting in the 172 used in the calculation.
 		 */
-        // 28 years of 365.25 days + the offset from molad tohu mentioned above
-        return elapsedDays % (28 * 365.25) == 172;
-    }
+		return elapsedDays % (28 * 365.25) == 172; // 28 years of 365.25 days + the offset from molad tohu mentioned above
+	}
 
 	/**
 	 * Return the type of year for <em>parsha</em> calculations. The algorithm follows the
@@ -704,7 +703,7 @@ public int getYomTovIndex() {
 			if (day == 15 || (day == 16 && !inIsrael)) {
 				return SUCCOS;
 			}
-			if (day >= 17 && day <= 20 || day == 16) {
+			if (day >= 16 && day <= 20) {
 				return CHOL_HAMOED_SUCCOS;
 			}
 			if (day == 21) {
@@ -785,7 +784,7 @@ public int getYomTovIndex() {
 	/**
 	 * Returns true if the current day is <em>Yom Tov</em>. The method returns true even for holidays such as {@link #CHANUKAH}
 	 * and minor ones such as {@link #TU_BEAV} and {@link #PESACH_SHENI}. <em>Erev Yom Tov</em> (with the exception of
-	 * {@link #HOSHANA_RABBA}, and <em>erev</em> the second days of {@link #PESACH}) returns false, as do {@link #isTaanis() fast
+	 * {@link #HOSHANA_RABBA} and <em>erev</em> the second days of {@link #PESACH}) returns false, as do {@link #isTaanis() fast
 	 * days} besides {@link #YOM_KIPPUR}. Use {@link #isAssurBemelacha()} to find the days that have a prohibition of work. 
 	 * 
 	 * @return true if the current day is a Yom Tov
@@ -799,7 +798,7 @@ public int getYomTovIndex() {
 	 */
 	public boolean isYomTov() {
 		int holidayIndex = getYomTovIndex();
-		if ((isErevYomTov() && (holidayIndex != HOSHANA_RABBA || (holidayIndex == CHOL_HAMOED_PESACH && getJewishDayOfMonth() != 20)))
+		if ((isErevYomTov() && (holidayIndex != HOSHANA_RABBA && holidayIndex != CHOL_HAMOED_PESACH))
 				|| (isTaanis() && holidayIndex != YOM_KIPPUR) || holidayIndex == ISRU_CHAG) {
 			return false;
 		}
@@ -1065,9 +1064,8 @@ public boolean isYomKippurKatan() {
 		if (day == 29 && dayOfWeek != Calendar.FRIDAY && dayOfWeek != Calendar.SATURDAY) {
 			return true;
 		}
-
-        return (day == 27 || day == 28) && dayOfWeek == Calendar.THURSDAY;
-    }
+		return (day == 27 || day == 28) && dayOfWeek == Calendar.THURSDAY;
+	}
 
 	/**
 	 * The Monday, Thursday and Monday after the first <em>Shabbos</em> after {@link #isRoshChodesh() <em>Rosh Chodesh</em>}
@@ -1084,8 +1082,8 @@ public boolean isBeHaB() {
 		int day = getJewishDayOfMonth();
 
 		if (month == JewishDate.CHESHVAN || month == JewishDate.IYAR) {
-            return (dayOfWeek == Calendar.MONDAY && day > 4 && day < 18)
-                    || (dayOfWeek == Calendar.THURSDAY && day > 7 && day < 14);
+			return (dayOfWeek == Calendar.MONDAY && day > 4 && day < 18)
+					|| (dayOfWeek == Calendar.THURSDAY && day > 7 && day < 14);
 		}
 		return false;
 	}
@@ -1419,7 +1417,7 @@ public int getTekufasTishreiElapsedDays() {
 	public boolean isVeseinTalUmatarStartDate() {
 		if (inIsrael) {
 			 // The 7th Cheshvan can't occur on Shabbos, so always return true for 7 Cheshvan
-            return getJewishMonth() == CHESHVAN && getJewishDayOfMonth() == 7;
+			return getJewishMonth() == CHESHVAN && getJewishDayOfMonth() == 7;
 		} else {
 			if (getDayOfWeek() == Calendar.SATURDAY) { //Not recited on Friday night
 				return false;
@@ -1430,7 +1428,7 @@ public boolean isVeseinTalUmatarStartDate() {
 				return getTekufasTishreiElapsedDays() == 47;
 			}
 		}
-    }
+	}
 
 	/**
 	 * Returns true if tonight is the first night to start reciting <em>Vesein Tal Umatar Livracha</em> (
@@ -1453,7 +1451,7 @@ public boolean isVeseinTalUmatarStartDate() {
 	public boolean isVeseinTalUmatarStartingTonight() {
 		if (inIsrael) {
 			// The 7th Cheshvan can't occur on Shabbos, so always return true for 6 Cheshvan
-            return getJewishMonth() == CHESHVAN && getJewishDayOfMonth() == 6;
+			return getJewishMonth() == CHESHVAN && getJewishDayOfMonth() == 6;
 		} else {
 			if (getDayOfWeek() == Calendar.FRIDAY) { //Not recited on Friday night
 				return false;
@@ -1464,7 +1462,7 @@ public boolean isVeseinTalUmatarStartingTonight() {
 				return getTekufasTishreiElapsedDays() == 46;
 			}
 		}
-    }
+	}
 
 	/**
 	 * Returns if <em>Vesein Tal Umatar Livracha</em> (<em>Sheailas Geshamim</em>) is recited. This will return