weeknum(y=-4712, w=0, d=1, f=0, sg=ITALY) private

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# File lib/date.rb, line 837
  def self.weeknum(y=-4712, w=0, d=1, f=0, sg=ITALY)
    unless jd = _valid_weeknum?(y, w, d, f, sg)
      raise ArgumentError, 'invalid date'
    new!(jd_to_ajd(jd, 0, 0), 0, sg)
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