the due date / the expiration date (of the term)

the last day of the year, New Year's Eve

(collective, chiefly attributive) Japan and China

the daytime, during the day / noon, midday

Saturday

(rare) a birthday

a lucky day, auspicious day

(rare) one's birthday

the first day of the month (solar or lunar calendar)

(obsolete) one day, 24 hours / (obsolete) the daytime, the period from dawn until dusk