January, 31 days
February, 28 days, 29 in leap years, or 30 on certain occasions in related calendars March, 31 days
April, 30 days
May, 31 days
June, 30 days
July, 31 days
August, 31 days
September, 30 days
October, 31 days
November, 30 days
December, 31 days