小の月
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Meanings
1
short month; month with fewer than 31 days
Refers to months with 30 or fewer days (February, April, June, September, November). Often contrasted with 大の月 (long month, 31 days).
See also: 大の月
For short months, you need to be careful with the dates at the end of the month.
February is a short month, with only 28 or 29 days.