4 sentences

1. 他昨晚十一点才回家。

   tā zuó​wǎn shí​yī​diǎn cái huí​jiā.

   He didn't get home until 11 o'clock last night.

   Source: Dong Chinese Dictionary

2. 现在是晚上十一点。

   xiàn​zài shì wǎn​shang shí​yī​diǎn.

   It's 11:00 at night.

   Source: OpenSubtitles

3. 学校规定晚上十一点准时熄灯。

   xué​xiào guī​dìng wǎn​shang shí​yī​diǎn zhǔn​shí xī​dēng.

   School regulations state that it's lights out at 11:00 PM sharp.

   Source: Dong Chinese Dictionary

4. 子时是指深夜十一点到凌晨一点。

   zǐ shí shì zhǐ shēn​yè shí​yī​diǎn dào líng​chén yī​diǎn.

   'Zishi' refers to the period from 11 PM to 1 AM.

   Source: Dong Chinese Dictionary