Get last day of the month in Ruby

Question

I made new object Date.new with args (year, month). After create ruby added 01 number of day to this object by default. Is there any way to add not first day, but last day o

Answer 1

require "date"
def find_last_day_of_month(_date)
 if(_date.instance_of? String)
   @end_of_the_month = Date.parse(_date.next_month.strftime("%Y-%m-01")) - 1
 else if(_date.instance_of? Date)
   @end_of_the_month = _date.next_month.strftime("%Y-%m-01") - 1
 end
 return @end_of_the_month
end

find_last_day_of_month("2018-01-01")

This is another way to find