Class

HebrewCal

HebrewCal(optionsopt)

Construct a new Hebrew calendar object. This class encodes information about the Hebrew (Jewish) calendar. The Hebrew calendar is a tabular hebrew calendar where the dates are calculated by arithmetic rules. This differs from the religious Hebrew calendar which is used to mark the beginning of particular holidays. The religious calendar depends on the first sighting of the new crescent moon to determine the first day of the new month. Because humans and weather are both involved, the actual time of sighting varies, so it is not really possible to precalculate the religious calendar. Certain groups, such as the Hebrew Society of North America, decreed in in 2007 that they will use a calendar based on calculations rather than observations to determine the beginning of lunar months, and therefore the dates of holidays.

Constructor

# new HebrewCal(optionsopt)

Parameters:
Name Type Attributes Description
options Object <optional>

Options governing the construction of this instance

View Source HebrewCal.js, line 41

Extends

Methods

# getMonLength(month, year) → {number}

Return the number of days in a particular month in a particular year. This function can return a different number for a month depending on the year because of leap years.

Parameters:
Name Type Description
month number

the month for which the length is sought

year number

the year within which that month can be found

Overrides:

View Source HebrewCal.js, line 194

the number of days within the given month in the given year, or 0 for an invalid month in the year

number

# getNumMonths(year)

Return the number of months in the given year. The number of months in a year varies for luni-solar calendars because in some years, an extra month is needed to extend the days in a year to an entire solar year. The month is represented as a 1-based number where 1=first month, 2=second month, etc.

Parameters:
Name Type Description
year number

a year for which the number of months is sought

Overrides:

View Source HebrewCal.js, line 181

# getType() → {string}

Return the type of this calendar.

Overrides:

View Source HebrewCal.js, line 217

the name of the type of this calendar

string

# isLeapYear(year) → {boolean}

Return true if the given year is a leap year in the Hebrew calendar. The year parameter may be given as a number, or as a HebrewDate object.

Parameters:
Name Type Description
year number | Object

the year for which the leap year information is being sought

Overrides:

View Source HebrewCal.js, line 207

true if the given year is a leap year

boolean

# lastDayOfMonth(month, year) → {number}

Return the date of the last day of the month for the given year. The date of the last day of the month is variable because a number of months gain an extra day in leap years, and it is variable which months gain a day for each leap year and which do not.

Parameters:
Name Type Description
month number

the month for which the number of days is sought

year number

the year in which that month is

View Source HebrewCal.js, line 148

the number of days in the given month and year

number

# static daysInYear(year) → {number}

Return the number of days in the given year. Years contain a variable number of days because the date of Rosh HaShanah (New Year's) changes so that it doesn't fall on particular days of the week. Days are added to the months of Heshvan and/or Kislev in the previous year in order to prevent the current year's New Year from being on Sunday, Wednesday, or Friday.

Parameters:
Name Type Description
year number

the year for which the length is sought

View Source HebrewCal.js, line 110

number of days in the given year

number