event B的trigger里填event A,然后把offset设成90——DH之前的版本是这样弄的,缺点是无法调用event A发生的日子,一旦读档检测周期就重置了,只能算是曲线救国的一种方法 而DH则增加了一个新属性,save_date = yse/no save_date = yes / no (default); If set saves date when this event has fired and that date can be used as a trigger by other events (delay event B to fire at least X days after event A).