A fixed or appointed date — the scheduled date for an event or meeting.
会議の期日は来週の月曜日に決まった。
The meeting's scheduled date was set for next Monday.
その仕事の期日をカレンダーに書いた。
I wrote the appointed date for that task on the calendar.
期日までに準備を終えるつもりだ。
I intend to finish preparations by the appointed date.
A deadline or due date for payments, submissions, etc.
支払いの期日は今月末です。
The payment due date is the end of this month.
申請の期日を確認してください。
Please check the application deadline.
期日を過ぎると遅延料金が発生します。
If you pass the deadline, late fees will be incurred.