# File lib/json/add/core.rb, line 38
38:   def to_json(*args)
39:     {
40:       'json_class' => self.class.name,
41:       'y' => year,
42:       'm' => month,
43:       'd' => day,
44:       'sg' => start,
45:     }.to_json(*args)
46:   end