The expression of calendar days requires the Japanese as well as the Chinese basic numbers systems. Japanese numbers are used from the first to the tenth as well as for the 14th and 24th day. All other days use the Chinese numbering system. Be careful for the 20th day, which is irregular.
| Day | Kanji | Furigana | Romaji |
| 1 | 一日 | ついたち | tsuitachi |
| 2 | 二日 | ふつか | futsuka |
| 3 | 三日 | みっか | mikka |
| 4 | 四日 | よっか | yokka |
| 5 | 五日 | いつか | itsuka |
| 6 | 六日 | むいか | muika |
| 7 | 七日 | なのか | nanoka |
| 8 | 八日 | ようか | youka |
| 9 | 九日 | ここのか | kokonoka |
| 10 | 十日 | とおか | tooka |
| 11 | 十一日 | じゅういちにち | juuichinichi |
| 12 | 十二日 | じゅうににち | juuninichi |
| 14 | 十四日 | じゅうよっか | juuyoka |
| 15 | 十五日 | じゅうごにち | juugonichi |
| 20 | 二十日 | はつか | hatsuka |
| 21 | 二十一日 | にじゅういちにち | nijuuichinichi |
| 24 | 二十四日 | にじゅうよっか | nijuuyokka |
| 31 | 三十一日 | さんじゅういちにち | sanjuuichinichi |
NIHONGO ICHIBAN 
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