two days, a two-day period / the second day after some set point in time / the second day of the month

all day

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

a birthday

regular day off (e.g. closed every Monday)

the twentieth day of the month / twenty days / Short for 二十日鼠 (hatsuka nezumi): a house mouse

幾日も幾日も: day after day

the Tangut script (a logographic writing system used for writing the Tangut language of the Western Xia Dynasty)

the Tangut language

Alternative form of 夏の大三角形