one day

the daytime, during the day / a half day, half of a day

before the day is done

(rare) the first day of the month

all day, throughout the day, sunrise to sunset, all around the clock

泰昌: a male given name

保光: a male given name / 泰光: a male given name

a male given name

(honorific) to sleep, to rest

one day, 24 hours / the daytime, the period from dawn until dusk / (figuratively) a short period of time / one day, someday, an unspecified day / the first day of the month