3 sentences

1. 这份报纸是当日出版的。

   zhè fèn bào​zhǐ shì dàng​rì chū​bǎn de.

   This newspaper was published on that very day.

   Source: Dong Chinese Dictionary

2. 会议将于当日上午十点整开始。

   huì​yì jiāng yú dāng​rì shàng​wǔ shí​diǎn zhěng kāi​shǐ.

   The meeting will begin at 10:00 AM sharp on that day.

   Source: Dong Chinese Dictionary

3. 我依然记得当日发生的所有细节。

   wǒ yī​rán jì​de dàng​rì fā​shēng de suǒ​yǒu xì​jié.

   I still remember every detail of what happened that day.

   Source: Dong Chinese Dictionary