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end

def jd_to_weeknum(jd, f=0, sg=GREGORIAN) # :nodoc:

a = find_fdoy(y, sg) + 6

w, d = (jd - (a - ((a - f) + 1) % 7) + 7).divmod(7)

return y, w, d

end

def jd_to_nth_kday(jd, sg=GREGORIAN) # :nodoc:

j = find_fdom(y, m, sg)

return y, m, ((jd - j) / 7).floor + 1, jd_to_wday(jd)

end

d += 8

end

if w < 0

jd_to_commercial(commercial_to_jd(y + 1, 1, 1, sg) + w * 7, sg)

return unless ny == y

w = nw

d += 7

end

if w < 0

jd_to_weeknum(weeknum_to_jd(y + 1, 1, f, f, sg) + w * 7, f, sg)

return unless ny == y

w = nw

if n < 0

ny, nm = (y * 12 + m).divmod(12)

nm, = (nm + 1) .divmod(1)

jd_to_nth_kday(nth_kday_to_jd(ny, nm, 1, k, sg) + n * 7, sg)

return unless [ny, nm] == [y, m]

n = nn