ssg: StaticSitePost, StaticSiteClient: impl EnsureDate, use in StaticSiteClient NewPost

src/managed/OpenLiveWriter.BlogClient/Clients/StaticSite/StaticSiteClient.cs

@@ -80,13 +80,12 @@ namespace OpenLiveWriter.BlogClient.Clients.StaticSite
             remotePost = null;
             etag = "";
 
-            // Set Date if not provided
-            if (post.DatePublished == new DateTime(1, 1, 1)) post.DatePublished = DateTime.Now;
-
             // Create a StaticSitePost on the provided post
             var ssgPost = new StaticSitePost(Config, post);
             // Ensure the post has an ID
             var newPostId = ssgPost.EnsureId();
+            // Ensure the post has a date
+            ssgPost.EnsureDatePublished();
             // Save the post to disk
             ssgPost.SaveToDisk();
 

src/managed/OpenLiveWriter.BlogClient/Clients/StaticSite/StaticSitePost.cs

@@ -61,6 +61,12 @@ namespace OpenLiveWriter.BlogClient.Clients.StaticSite
             set => BlogPost.Slug = _safeSlug = value;
         }
 
+        public DateTime DatePublished
+        {
+            get => BlogPost.DatePublished;
+            set => BlogPost.DatePublished = value;
+        }
+
         /// <summary>
         /// Confirmed safe slug; does not conflict with any existing post on disk or points to this post on disk.
         /// </summary>
@@ -121,6 +127,16 @@ namespace OpenLiveWriter.BlogClient.Clients.StaticSite
             return Id;
         }
 
+        /// <summary>
+        /// Set post published DateTime to current DateTime if one isn't already set, or current one is default.
+        /// </summary>
+        /// <returns>The current or new DatePublished.</returns>
+        public DateTime EnsureDatePublished()
+        {
+            if (DatePublished == null || DatePublished == new DateTime(1, 1, 1)) DatePublished = DateTime.Now;
+            return DatePublished;
+        }
+
         /// <summary>
         /// Generate a slug for this post based on it's title or a preferred slug
         /// </summary>