title and archive page

gatsby-node.js

@@ -6,11 +6,24 @@ exports.onCreateNode = ({ node, getNode, actions }) => {
 
     if (node.internal.type === `MarkdownRemark`) {
         var slug = createFilePath({ node, getNode, basePath: `pages` });
+        var date = new Date(node.frontmatter.date);
+        var year = date.getFullYear();
+        var month = date.getMonth();
         createNodeField({
             node,
             name: `slug`,
             value: slug,
         });
+        createNodeField({
+            node,
+            name: `year`,
+            value: year,
+        });
+        createNodeField({
+            node,
+            name: `month`,
+            value: month,
+        });
     }
 };