HSK 1
日
rì量（名）
(bound form) sun; day; day of the month; (bound form) Japan (abbr. for 日本)
今天是十月一日星期三。
Jīntiān shì shí yuè yī rì xīngqī sān.
Today is Wednesday, October first.
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Appears across levels (1（4）) in the HSK 3.0 word list.