# File lib/json/add/core.rb, line 28
28:   def to_json(*args)
29:     {
30:       'json_class' => self.class.name,
31:       'y' => year,
32:       'm' => month,
33:       'd' => day,
34:       'sg' => sg,
35:     }.to_json(*args)
36:   end