From 64541ef84efbc786271d40acd203e843783b555a Mon Sep 17 00:00:00 2001
From: Alan Orth <alan.orth@gmail.com>
Date: Thu, 19 Jan 2017 16:25:13 +0200
Subject: [PATCH] layouts/partials/opengraph.html: Improve date handling

Both the Facebook and OpenGraph documentation specify the usage of
article:published_time and article:modified_time tags for articles.
For websites, however, the Facebook documentation recommends the
og:updated_time tag instead.

See: https://developers.facebook.com/docs/reference/opengraph/object-type/article
See: http://ogp.me
See: https://developers.facebook.com/docs/reference/opengraph/object-type/website
---
 layouts/partials/opengraph.html | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/layouts/partials/opengraph.html b/layouts/partials/opengraph.html
index e5e6431..0781c4c 100644
--- a/layouts/partials/opengraph.html
+++ b/layouts/partials/opengraph.html
@@ -6,7 +6,13 @@
   <meta property="og:image" content="{{ . | absURL }}" />
 {{ end }}{{ end }}
 
-{{ if not .Date.IsZero }}<meta property="og:updated_time" content="{{ .Date.Format "2006-01-02T15:04:05-07:00" | safeHTML }}"/>{{ end }}{{ with .Params.audio }}
+{{ if .IsPage }}
+{{ if not .Date.IsZero }}<meta property="article:published_time" content="{{ .Date.Format "2006-01-02T15:04:05-07:00" | safeHTML }}"/>{{ end }}
+{{ if not .Lastmod.IsZero }}<meta property="article:modified_time" content="{{ .Lastmod.Format "2006-01-02T15:04:05-07:00" | safeHTML }}"/>{{ end }}
+{{ else }}
+{{ if not .Site.LastChange.IsZero }}<meta property="og:updated_time" content="{{ .Date.Format "2006-01-02T15:04:05-07:00" | safeHTML }}"/>{{ end }}
+{{ end }}
+{{ with .Params.audio }}
 <meta property="og:audio" content="{{ . }}" />{{ end }}{{ with .Params.locale }}
 <meta property="og:locale" content="{{ . }}" />{{ end }}{{ with .Site.Params.title }}
 <meta property="og:site_name" content="{{ . }}" />{{ end }}{{ with .Params.videos }}