2 sentences

1. 新年的钟声在零时准时敲响。

   xīn​nián de zhōng​shēng zài líng​shí zhǔn​shí qiāo​xiǎng.

   The New Year's bell chimed exactly at midnight.

   Source: Dong Chinese Dictionary

2. 突击行动的零时定在明天清晨五点。

   tū​jī xíng​dòng de líng​shí dìng zài míng​tiān qīng​chén wǔ diǎn.

   Zero hour for the raid is set for five o'clock tomorrow morning.

   Source: Dong Chinese Dictionary