establish something as being later relative to something else
postdate详细解释
post.date v.tr.（及物动词）post.dat.ed,post.dat.ing,post.dates To put a date on (a check, for example) that is later than the actual date.填迟日期：（如在支票上）填写比实际日期晚的日期To occur later than; follow in time.发生于…之后；时间上后于
