21時に終わる予定 I'm supposed to finish working at 21時

Both "〜予定" (〜yotei) and "〜つもり" (〜tsumori) convey different aspects of intention or expectation.

〜予定

This translates to "plan" or "schedule" in English.

It indicates something that is officially arranged, scheduled, or planned to happen.

明日はピクニックの予定があります

I have a picnic scheduled for tomorrow

1. 〜つもり (〜tsumori):
   • This expresses one's intention or expectation regarding a future action.
   • It reflects a personal plan or belief about what one is going to do.
   • Example: "明日はピクニックをするつもりです" (Ashita wa pikunikku o suru tsumori desu) means "I intend to have a picnic tomorrow."

In summary, "〜予定" refers to a scheduled or planned event, while "〜つもり" is more about one's personal intention or expectation regarding a future action.