fix post sorting issue

Gemfile

@@ -1,7 +1,5 @@
 source 'https://rubygems.org'
 
-ruby '2.4.1'
-
 gem 'rails'
 gem 'sqlite3'
 gem 'puma', '~> 3.11'

Gemfile.lock

@@ -318,8 +318,5 @@ DEPENDENCIES
   uglifier
   web-console (>= 3.3.0)
 
-RUBY VERSION
-   ruby 2.4.1p111
-
 BUNDLED WITH
-   1.16.0
+   1.16.1

app/models/post.rb

@@ -21,10 +21,10 @@ class Post
     @words.join(" ")
   end
   def template_name
-    "#{date}-#{@words.join("-")}"
+    "#{year}-#{month.to_s.rjust(2, '0')}-#{day.to_s.rjust(2, '0')}-#{@words.join("-")}"
   end
   def date
-    "#{year}-#{month}-#{day}"
+    Date.new(year,month,day)
   end
   def parse_int( value , max)
     ret = value.to_i

spec/models/blog_spec.rb

@@ -31,10 +31,10 @@ RSpec.describe Post, type: :model do
       expect(@post.month).to eq 2
     end
     it "returns date" do
-      expect(@post.date).to eq "1993-2-4"
+      expect(@post.date).to eq Date.new(1993,2,4)
     end
     it "returns file_name" do
-      expect(@post.template_name).to eq "1993-2-4-title"
+      expect(@post.template_name).to eq "1993-02-04-title"
     end
   end