How to get the number of days in a given month in Ruby, accounting for year?

Question

I\'m sure there\'s a good simple elegant one-liner in Ruby to give you the number of days in a given month, accounting for year, such as \"February 1997\". What is it?

Answer 1

revise the input for other format

def days_in_a_month(date = "2012-02-01")
  date.to_date.end_of_month.day
end