sun / daytime, daylight / day

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

the eighth day of the month / eight days

the ninth day of the month / nine days

the seventh day of the month / seven days

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

(literary) one day, 24 hours / (literary) the daytime, the period from dawn until dusk / (literary) (figuratively) a short period of time

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

(rare, obsolete) (all senses appear to be identical as for hitohi above)

a national holiday in Japan on the birthday of the 今上天皇 (Kinjō Tennō, “present reigning emperor”), currently February 23