0942承認済み名無しさん
2017/11/27(月) 20:32:33.81ID:incGBkDONearest 2 months in the March Quarterly cycle (Mar, Jun, Sep, Dec) plus the nearest 2 "serial" months not in the March Quarterly cycle.
Contract months for initial listing: Dec 2017, Jan 2018, Feb 2018, Mar 2018.
調べてみたら四半期に1回と、それとは別に2回あるっぽい?