Return the number of days in the given month.
If no year is specified, it will use the current year.
# File activesupport/lib/active_support/core_ext/time/calculations.rb, line 17
def days_in_month(month, year = now.year)
return 29 if month == 2 && ::Date.gregorian_leap?(year)
COMMON_YEAR_DAYS_IN_MONTH[month]
end