add datePublished & dateModified to schema.org tags

src/components/atoms/SEO/MetaTags.tsx

@@ -19,13 +19,17 @@ export default function MetaTags({
   image,
   url,
   postSEO,
-  title
+  title,
+  datePublished,
+  dateModified
 }: {
   description: string
   image: string
   url: string
   postSEO: boolean
   title: string
+  datePublished: string
+  dateModified: string
 }) {
   const { siteTitle, siteDescription, siteUrl, author } = useSiteMetadata()
 
@@ -40,7 +44,17 @@ export default function MetaTags({
       <meta name="image" content={image} />
       <link rel="canonical" href={url} />
 
-      {schemaOrg(siteUrl, title, postSEO, url, image, description, author.name)}
+      {schemaOrg(
+        siteUrl,
+        title,
+        postSEO,
+        url,
+        image,
+        description,
+        author.name,
+        datePublished,
+        dateModified
+      )}
 
       <meta property="og:title" content={title} />
       <meta property="og:description" content={description} />

src/components/atoms/SEO/index.tsx

@@ -60,6 +60,8 @@ export default function SEO({
       url={url}
       postSEO={postSEO}
       title={title}
+      datePublished={post && post.fields && post.fields.date}
+      dateModified={post && post.frontmatter.updated}
     />
   )
 }

src/components/atoms/SEO/schemaOrg.tsx

@@ -7,12 +7,14 @@ export default function schemaOrg(
   postURL: string,
   image: string,
   description: string,
-  author?: string
+  author: string,
+  datePublished: string,
+  dateModified: string
 ) {
   const schemaOrgJSONLD: any = [
     {
       '@context': 'http://schema.org',
-      '@type': 'WebSite',
+      '@type': 'Blog',
       url: blogURL,
       name: title
     }
@@ -22,8 +24,14 @@ export default function schemaOrg(
     schemaOrgJSONLD.push({
       '@context': 'http://schema.org',
       '@type': 'BlogPosting',
-      author,
-      publisher: author,
+      author: {
+        '@type': 'Person',
+        name: author
+      },
+      publisher: {
+        '@type': 'Organization',
+        name: author
+      },
       url: postURL,
       name: title,
       headline: title,
@@ -31,7 +39,13 @@ export default function schemaOrg(
         '@type': 'ImageObject',
         url: image
       },
-      description
+      description,
+      datePublished,
+      dateModified: dateModified || datePublished,
+      mainEntityOfPage: {
+        '@type': 'Blog',
+        '@id': blogURL
+      }
     })
   }