行期的英文：
date of departure

参考例句：

To delay the journey
延宕行期

date是什么意思：
n. 日期；年代；约会；约会对象
v. 鉴定…的年代；注明日期；和…约会

Have you fixed on the date?
日期选定了吗?

The From date for the period must be earlier than the To date.
时间段的起始时间不能晚于结束时间。

Date of filling: the actual date of filling the return.
填表日期:填写办理纳税申报表的实际日期。

Can you cancel a date with decorum?
你能够有礼貌地取消约会吗?

I'll have a date tonight.
今晚我有个约会。

departure是什么意思：
n. 离开；出发；违背；辞职

The cold weather antedated their departure.
寒冷的天气使他们提前离开。

We apologise for the late departure of this flight.
本航班延误离境，谨致歉意。

His sudden departure was a disadvantage to the campaign.
他的突然离去对竞选造成不利影响。

So the archdeacon and the precentor took their departure
这样，会吏长和圣诗班领唱人便起身告辞。

You have to be there half an hour before departure time.
你要在飞机起飞前半小时到达那里。