Module: HebrewDateSupport::HolidayMethods

Included in:
HebrewDate
Defined in:
lib/support/holidays.rb

Defined Under Namespace

Modules: ClassMethods

Instance Method Summary collapse

Instance Method Details

#candle_lighting_day? ⇒ Boolean

Whether there is candle lighting today, i.e.it is either Friday, Erev Yom Tov, or 1st day yom tov when there is a second day.

Returns:

  • (Boolean) 


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# File 'lib/support/holidays.rb', line 355

def candle_lighting_day?
  return true if self.day == 6
  return true if first_day_yom_tov?
  case @hebrew_month
    when 6
      # Erev Rosh Hashana
      return true if @hebrew_date == 29
    when 7
      # Erev Yom Kippur, Erev Sukkos, Erev Shmini Atzeres
      return true if [9, 14, 21].include?(@hebrew_date)
    when 1
      # Erev Pesach or Erev 7th day Pesach
      return true if [14, 20].include?(@hebrew_date)
    when 3
      # Erev Shavuos
      return true if @hebrew_date == 5
  end
  false
end

#first_day_yom_tov? ⇒ Boolean

Is this day a first day of Yom Tov? Only should return true if there is a second day.

Returns:

  • (Boolean) 


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# File 'lib/support/holidays.rb', line 313

def first_day_yom_tov?
  # only second day Yom Tov in Israel is Rosh Hashana
  if @israeli
    return @hebrew_month == 7 && @hebrew_date == 1
  end
  case @hebrew_month
    when 7
      # Rosh Hashana, Sukkos, and Shmini Atzeres
      return true if [1, 15, 22].include?(@hebrew_date)
    when 1
      # 2nd and last days Pesach
      return true if [15, 21].include?(@hebrew_date)
    when 3
      # Shavuos
      return true if @hebrew_date == 6
  end
  false
end

#havdala_day? ⇒ Boolean

Whether there is Havdala today. This would be Sat. night (except for a Yom Tov night), or Motzei Yom Tov (except for Fri. night).

Returns:

  • (Boolean) 


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# File 'lib/support/holidays.rb', line 378

def havdala_day?
  # if today is a candlelighting day, then there is no havdala
  return false if candle_lighting_day?

  # if today is Sat. night, return true unless it is Yom Tov
  if self.day == 7
    case @hebrew_month
      when 7
        # 1st day Rosh Hashana
        if @hebrew_date == 1
          false
        else
          # Sukkos 1 and Shmini Atzeres if outside Israel
          @israeli || ![15, 21].include?(@hebrew_date)
        end
      when 1
        # Pesach 1 or 7
        @israeli || ![15, 21].include?(@hebrew_date)
      when 3
        # Shavos 1
        @israeli || @hebrew_date != 6
      else
        true
    end
  else
    # detect Motzai Yom Tov on non-Sat. night
    case @hebrew_month
      when 7
        # Rosh Hashana 2, Yom Kippur, Sukkos, Shmini Atzeres
        [2, 10].include?(@hebrew_date) ||
          (@israeli && [15, 22].include?(@hebrew_date)) ||
          (!@israeli && [16, 23].include?(@hebrew_date))
      when 1
        # Pesach 1/7 or 2/8
        (@israeli && [15, 21].include?(@hebrew_date)) ||
          (!@israeli && [16, 22].include?(@hebrew_date))
      when 3
        # Shavuos
        (@israeli && @hebrew_date == 6) || (!@israeli && @hebrew_date == 7)
      else
        false
    end
  end
end

#holiday(generic = false) ⇒ String

Returns a string of the Jewish holiday or fast day for the current day, or an empty string if there is no holiday for this day. (e.g. “Pesach”) or a specific one (e.g. “Chol Hamoed Pesach”).

Parameters:

  • generic (Boolean) (defaults to: false) —

    whether you want just a generic name

Returns:

  • (String) 


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# File 'lib/support/holidays.rb', line 146

def holiday(generic=false)

  # check by month (starts from Nissan)
  case @hebrew_month
    when 1
      if @hebrew_date == 12 && self.thursday?
        return @ashkenaz ? "Ta'anis Bechorim" : "Ta'anit Bechorim"
      end
      return 'Erev Pesach' if @hebrew_date == 14
      if @hebrew_date == 15 || @hebrew_date == 21 ||
        (!@israeli && (@hebrew_date == 16 || @hebrew_date == 22))
        return 'Pesach'
      end
      if @hebrew_date >= 17 && @hebrew_date <= 20 ||
        (@hebrew_date == 16 && @israeli)
        return generic ? 'Pesach' : 'Chol Hamoed Pesach'
      end
    when 2
      return 'Pesach Sheni' if @hebrew_date == 14
      if @hebrew_date == 5 && [1, 3, 4, 5].include?(self.day)
        return "Yom Ha'atzmaut"
      end
      return "Yom Ha'atzmaut" if @hebrew_date == 6 && self.day == 3
      return "Yom Ha'atzmaut" if [3, 4].include?(@hebrew_date) &&
        self.day == 5
      if @hebrew_date == 4 && [2, 3, 4, 7].include?(self.day)
        return 'Yom Hazikaron'
      end
      return 'Yom Hazikaron' if @hebrew_date == 5 && self.day == 2
      return 'Yom Hazikaron' if [2, 3].include?(@hebrew_date) &&
        self.day == 4
      return 'Yom Yerushalayim' if @hebrew_date == 28
    when 3
      if @hebrew_date == 5
        return @ashkenaz ? 'Erev Shavuos' : 'Erev Shavuot'
      end
      if @hebrew_date == 6 || (@hebrew_date == 7 && !@israeli)
        return @ashkenaz ? 'Shavuos' : 'Shavuot'
      end
    when 4
      # push off the fast day if it falls on Shabbos
      if (@hebrew_date == 17 && self.day != 7) ||
        (@hebrew_date == 18 && self.day == 1)
        return 'Tzom Tammuz'
      end
    when 5
      # if Tisha B'Av falls on Shabbos, push off until Sunday
      if (self.day == 1 && @hebrew_date == 10) ||
        (self.day != 7 && @hebrew_date == 9)
        return "Tisha B'av"
      end
      return "Tu B'Av" if @hebrew_date == 15
    when 6
      return 'Erev Rosh Hashanah' if @hebrew_date == 29
    when 7
      return 'Rosh Hashanah' if [1, 2].include?(@hebrew_date)
      # push off Tzom Gedalia if it falls on Shabbos
      if (@hebrew_date == 3 && self.day != 7) ||
        (@hebrew_date == 4 && self.day == 1)
        return 'Tzom Gedalia'
      end
      return 'Erev Yom Kippur' if @hebrew_date == 9
      return 'Yom Kippur' if @hebrew_date == 10
      if @hebrew_date == 14
        return @ashkenaz ? 'Erev Sukkos' : 'Erev Sukkot'
      end
      if @hebrew_date == 15 || (@hebrew_date == 16 && !@israeli)
        return @ashkenaz ? 'Sukkos' : 'Sukkot'
      end
      if @hebrew_date >= 17 && @hebrew_date <= 20 ||
        (@hebrew_date == 16 && @israeli)
        if @ashkenaz
          return generic ? 'Sukkos' : 'Chol Hamoed Sukkos'
        else
          return generic ? 'Sukkot' : 'Chol Hamoed Sukkot'
        end
      end
      return 'Hoshana Rabah' if @hebrew_date == 21
      if @hebrew_date == 22
        return @ashkenaz ? 'Shmini Atzeres' : 'Shmini Atzeret'
      end
      if @hebrew_date == 23 && !@israeli
        return @ashkenaz ? 'Simchas Torah' : 'Simchat Torah'
      end
    when 9
      return 'Erev Chanukah' if @hebrew_date == 24
      return 'Chanukah' if @hebrew_date >= 25
    when 10
      if @hebrew_date == 1 || @hebrew_date == 2 ||
        (@hebrew_date ==3 && _kislev_short?)
        return 'Chanukah'
      end
      if @hebrew_date == 10
        return @ashkenaz ? 'Tzom Teves' : 'Tzom Tevet'
      end
    when 11
      return "Tu B'Shvat" if @hebrew_date == 15
    when 12
      if hebrew_leap_year?
        return 'Purim Katan' if @hebrew_date == 14
      else
        # if 13th Adar falls on Fri or Shabbos, push back to Thursday
        if ((@hebrew_date == 11 || @hebrew_date == 12) && self.day == 5) ||
          (@hebrew_date == 13 && ![6, 7].include?(self.day))
          return @ashkenaz ? "Ta'anis Esther" : "Ta'anit Esther"
        end
        return 'Purim' if @hebrew_date == 14
        return 'Shushan Purim' if @hebrew_date == 15
      end
    when 13
      # if 13th Adar falls on Fri or Shabbos, push back to Thursday
      if ((@hebrew_date == 11 || @hebrew_date == 12) && self.day == 5) ||
        (@hebrew_date == 13 && ![6, 7].include?(self.day))
        return @ashkenaz ? "Ta'anis Esther" : "Ta'anit Esther"
      end
      return 'Purim' if @hebrew_date == 14
      return 'Shushan Purim' if @hebrew_date == 15
    else
      # if we get to this stage, then there are no holidays for the given date
      ''
  end
end

#omer(for_night = false) ⇒ Integer

Get the number of the Omer for this day, or nil if there isn’t one.

Parameters:

  • for_night (Boolean) (defaults to: false) —

    if true, give the Omer count for the previous night - i.e. 1 more than the Omer for the current day.

Returns:

  • (Integer) 


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# File 'lib/support/holidays.rb', line 273

def omer(for_night=false)
  for_night_offset = for_night ? 1 : 0
  if for_night && @hebrew_month == 1 && @hebrew_date == 15
    1
  elsif for_night && @hebrew_month == 3 && @hebrew_date == 5
    nil
  elsif @hebrew_month == 1 && @hebrew_date >= 16
    # Nissan, second day of Pesach and on
    @hebrew_date - 15 + for_night_offset
  elsif @hebrew_month == 2 # Iyar
    @hebrew_date + 15 + for_night_offset
  elsif @hebrew_month == 3 && @hebrew_date < 6
    # Sivan, before Shavuos
    @hebrew_date + 44 + for_night_offset
  end
end

#omer_to_s ⇒ String

Returns the omer day in the form “Omer X” or “Lag B’Omer” or an empty string if there is no omer this day.

Returns:

  • (String) 


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# File 'lib/support/holidays.rb', line 293

def omer_to_s
  omer = self.omer
  if omer.nil?
    ''
  elsif omer == 33
    "Lag B'Omer"
  else
    "Omer #{omer}"
  end
end

#rosh_chodesh? ⇒ Boolean

Is this date Rosh Chodesh?

Returns:

  • (Boolean) 


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# File 'lib/support/holidays.rb', line 306

def rosh_chodesh?
  @hebrew_date == 1 || @hebrew_date == 30
end

#second_day_yom_tov? ⇒ Boolean

Is this a second day of yom tov?

Returns:

  • (Boolean) 


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# File 'lib/support/holidays.rb', line 333

def second_day_yom_tov?
  # only second day Yom Tov in Israel is Rosh Hashana
  if @israeli
    return @hebrew_month == 7 && @hebrew_date == 2
  end
  case @hebrew_month
    when 7
      # Rosh Hashana, Sukkos, and Shmini Atzeres
      return true if [2, 16, 23].include?(@hebrew_date)
    when 1
      # 2nd and last days Pesach
      return true if [16, 22].include?(@hebrew_date)
    when 3
      # Shavuos
      return true if @hebrew_date == 6
  end
  false
end