new_by_frags

# File lib/date.rb, line 1683
  def self.new_by_frags(elem, sg) # :nodoc:
    elem = rewrite_frags(elem)
    elem = complete_frags(elem)
    unless (jd = valid_date_frags?(elem, sg)) &&
           (fr = valid_time_frags?(elem))
      raise ArgumentError, 'invalid date'
    end
    fr += (elem[:sec_fraction] || 0) / 86400
    of = Rational(elem[:offset] || 0, 86400)
    new!(jd_to_ajd(jd, fr, of), of, sg)
  end