>>(n)
public
Return a new Date object that is n months later than the
current one.
If the day-of-the-month of the current Date is
greater than the last day of the target month,
the day-of-the-month of the returned Date will be
the last day of the target month.
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def >> (n)
y, m = (year * 12 + (mon - 1) + n).divmod(12)
m, = (m + 1) .divmod(1)
d = mday
until jd2 = _valid_civil?(y, m, d, @sg)
d -= 1
raise ArgumentError, 'invalid date' unless d > 0
end
self + (jd2 - jd)
end