日暮 is poetic and literary — common in classical poetry and song lyrics. Everyday equivalents are 黄昏 (huánghūn) or 傍晚 (bàngwǎn).
culture
The Tang poet Cui Hao's line 日暮乡关何处是 (Rìmù xiāngguān héchù shì, 'At dusk, where is my hometown?') from 黄鹤楼 is one of the most quoted lines in Chinese poetry — 日暮 is forever tied to homesickness in literary memory.
