日夜 (rì yè) means “day and night; around the clock”. It is an HSK 6 Chinese word in the HSK 3.0 vocabulary.
Practice each character:
工人们日夜赶工建设大桥。
Gōngrénmen rìyè gǎngōng jiànshè dàqiáo.
The workers work day and night to build the bridge.
Updated: 2026-07-18