noun
date and time
Used for scheduled events, meetings, departures, etc., specifying both the calendar date and the clock time.
会議の日時はまだ決まっていません。
The date and time of the meeting haven't been decided yet.
出発の日時をお知らせください。
Please let me know the date and time of departure.
noun
days and hours
Refers to a span or collection of days and hours, often in contexts like opening hours, business days, or duration.
営業日時は月曜から金曜の9時から17時です。
Business days and hours are Monday to Friday, 9 a.m. to 5 p.m.