fix: adjust blog dates format (#665)

Signed-off-by: Tomás Castillo <tcastilloboireau@gmail.com>

Author: tomrndom

src/components/BlogRoll.js

@@ -100,7 +100,7 @@ export default ({ customFilter }) => (
                 title
                 templateKey
                 hidePost
-                date (formatString: "DD/MM/YYYY", locale: "en_us")
+                date (formatString: "MM/DD/YYYY", locale: "en_us")
                 author
                 category {
                   label

src/templates/blog-post.js

@@ -122,7 +122,7 @@ export const pageQuery = graphql`
       id
       html
       frontmatter {
-        date (formatString: "DD/MM/YYYY", locale: "en_us")
+        date (formatString: "MM/DD/YYYY", locale: "en_us")
         title
         author
         seo {