30 days in September, April, June and November.
all the rest are 31, apart from february which has 28. except in a leap-year when it has 29.
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The eighth month of a year of the Gregorian calendar, August, has 31 days.
April has 30 days in the modern Gregorian calendar.
The shortest "month" of the Gregorian calendar has 28 days.
Not in the Gregorian calendar.
365 days and its divided into 18 months. Each month had 20 days