fix api/users/:login/headmaps.json bug

app/controllers/users/headmaps_controller.rb

@@ -10,15 +10,15 @@ class Users::HeadmapsController < Users::BaseController
   private 
   def start_stamp
     if params[:year].present?
-      Date.new(params[:year], 1).to_time.to_i
+      Date.new(params[:year].to_i, 1).to_time.to_i
     else 
-      Date.today.to_time.to_i - 365*24*60*60
+      (Date.today  - 1.years).to_time.to_i  
     end
   end
 
   def end_stamp 
     if params[:year].present?
-      Date.new(params[:year], 1).to_time.to_i + 365*24*60*60
+      (Date.new(params[:year].to_i, 1) + 1.years).to_time.to_i
     else 
       Date.today.to_time.to_i 
     end