method

_valid_ordinal?

ruby latest stable - Class: Date

_valid_ordinal?(y, d, sg=GREGORIAN)

public

Do the year y and day-of-year d make a valid Ordinal Date? Returns the corresponding Julian Day Number if they do, or nil if they don’t.

d can be a negative number, in which case it counts backwards from the end of the year (-1 being the last day of the year). No year wraparound is performed, however, so valid values of d are -365 .. -1, 1 .. 365 on a non-leap-year, -366 .. -1, 1 .. 366 on a leap year. A date falling in the period skipped in the Day of Calendar Reform adjustment is not valid.

sg specifies the Day of Calendar Reform.

# File lib/date.rb, line 590
    def _valid_ordinal? (y, d, sg=GREGORIAN) # :nodoc:
      if d < 0
        return unless j = find_ldoy(y, sg)
        ny, nd = jd_to_ordinal(j + d + 1, sg)
        return unless ny == y
        d = nd
      end
      jd = ordinal_to_jd(y, d, sg)
      return unless [y, d] == jd_to_ordinal(jd, sg)
      jd
    end

_valid_ordinal?

Method deprecated or moved

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