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

In Rails project for current date

Time.days_in_month(Time.now.month, Time.now.year)

For any date t which is instance of Time

Time.days_in_month(t.month, t.year)

or

t.end_of_month.day

.
If you have UTC seconds, you need to get an instance of Time first

Time.at(seconds).end_of_month.day