当日

the day in question, that day

t o̞ː ʑ i t͡s ɨ
noun Rare #35,622
the day in question, that day
JA: 当日は受付で名前を伝えてください。
EN: On the day in question, please give your name at the reception desk.

マレスキー氏が亡くなる前日それを当日適用するのは間違っている

It is wrong to apply that to the day Mr. Malesky died instead of the day before.

— 落下の解剖学 (2023)

でも当日はない

But not on the day itself.

— 落下の解剖学 (2023)

チケットは当日でも買えますか

Can I buy tickets on the day?

当日OKなやつ

One that’s okay for the same day.

— アバウト・タイム ~愛おしい時間について~ (2013)

殺害当日アリバイがありません

You don't have an alibi for the day of the murder, do you?

Sounds similar to