payable at a fixed date meaning in English

定期付款

Article 39 where a bill of exchange is drawn payable at a fixed date or at a fixed period after the date of issue , the holder shall present the bill to the drawee for acceptance before the date of maturity
第三十九条定日付款或者出票后定期付款的汇票，持票人应当在汇票到期日前向付款人提示承兑。
Article 58 where the drawee makes payment before the date of maturity for a bill of exchange payable at a fixed date , at a fixed period after the date of issue , or at a fixed period after sight , the drawee shall bear the liability deriving therefrom on his own
第五十八条对定日付款、出票后定期付款或者见票后定期付款的汇票，付款人在到期日前付款的，由付款人自行承担所产生的责任。