The basic rule for dates is number + nichi. For example, juuichi-nichi (11th), juuni-nichi (12th), nijuugo-nichi (25th) and so on. However, 1st~10th, 14th, 20th and 24th are irregular.
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1st
tsuitachi
一日
2nd
futsuka
二日
3rd
mikka
三日
4th
yokka
四日
5th
itsuka
五日
6th
muika
六日
7th
nanoka
七日
8th
youka
八日
9th
kokonoka
九日
10th
touka
十日
14th
juuyokka
十四日
20th
hatsuka
二十日
24th
nijuuyokka
二十四日
