7/3: スケジュールの調整について

(c)は時間割を変える場合。 (d)は日程の変更。

c) Could you change the schedule? d) Could you reschedule 〜?

If we use (c), we're asking someone to make changes to an existing schedule. We use this if we are talking about the schedule in the sense of "timetable". Changing it could mean adjusting the time of certain events or rearranging their order.

We can only use (c) if the schedule has already been defined.