我把日历挂在墙上了。

Wǒ bǎ rìlì guà zài qiáng shàng le.

I hung the calendar on the wall.

如果你不想忘记开会的时间，那么你可以把它写在日历上。

Rúguǒ nǐ bù xiǎng wàngjì kāihuì de shíjiān, nàme nǐ kěyǐ bǎ tā xiě zài rìlì shàng.

If you don't want to forget when the meeting is, then you can write it on your callendar.

她已在日历上记下了结婚的日子。

Tā yǐ zài rìlì shàng jìxià le jiéhūn de rìzi.

She’s already marked the wedding date on the calendar.