There were 30 days in June of 2014. Every year, there are 30 days in September, April, June and November. The number of days in a given month does not change, except for February during leap years.
A popular traditional English mnemonic rhyme titled, "Thirty days hath September" is commonly used to remember the lengths of the months in the Julian and Gregorian calendars. While the rhyme has many variants, the "Thirty days hath September" mnemonic states that "Thirty days hath September, April, June and November. All the rest have 31, except for February all alone. It has 28 each year, but 29 each leap year."