expiration date of letter of credit

例句：

1. 1.The contract has an expiration date of June 30th.
   这份合同有一个6月30日的到期日。
2. 2.The bank will not honor the check if it is not paid within the expiration date.
   如果支票在到期日前未支付，银行将不予兑现。
3. 3. The company's stock is due to expire on December 31st.
   该公司的股票将在12月31日到期。