1 files changed, 24 insertions, 4 deletions
diff --git a/lib/sublab_calendar/occurrence.rb b/lib/sublab_calendar/occurrence.rb
index fad58a8..085a814 100644
--- a/lib/sublab_calendar/occurrence.rb
+++ b/lib/sublab_calendar/occurrence.rb
@@ -17,10 +17,24 @@ module SublabCalendar
       }
     end
 
-    def inspect
-      to_s
+    def to_json(*args)
+      to_h.to_json(*args)
     end
 
+    def to_s
+      "<#{self.class} #{self.to_h}>"
+    end
+    alias_method :inspect, :to_s
+
+    def <=>(other)
+      self.dtstart.to_datetime <=> other.dtstart.to_datetime
+    end
+
+    def ==(o)
+      o.class == self.class && o.state == state
+    end
+    alias_method :eql?, :==
+
     def summary
       event.summary
     end
@@ -29,8 +43,14 @@ module SublabCalendar
       event.description
     end
 
-    def to_s
-      "<#{self.class} #{self.to_h}>"
+    def dtstart
+      start_time.to_datetime
+    end
+
+    protected
+
+    def state
+      [event.uid, start_time, end_time]
     end
 
   end