21日に帰ってくるよていです。

The special noun 予定(よてい)is used to tell somebody about a schedule.

21日に帰ってくるよていです。
I’m due to come back on the 21st.

Note, even though this word is often written in hiragana when used as a verb ending, it is usually written in kanji when used as a noun.

明日の予定はなんですか。
What is tomorrow’s schedule?

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