‘择日’ literally means ‘to select a day’—‘择’ (zé) means ‘to choose’ or ‘to select’, and ‘日’ (rì) means ‘day’. But in practice, it specifically refers to choosing an auspicious or lucky date for important life events, based on traditional Chinese astrology, lunar calendars, and feng shui principles. This custom is deeply rooted in Chinese culture and commonly applied before weddings, moving into a new home, starting a business, or holding funerals.

The process often involves consulting a fortune teller or almanac (黄历 huánglì) to avoid inauspicious days associated with certain zodiac signs, elemental clashes, or taboos. While modern urban Chinese may treat it more lightly—or even skip it altogether—the phrase remains widely understood and frequently used in formal announcements, invitations, and family discussions about major plans. It carries a sense of respect for tradition and intentionality, rather than mere calendar planning.