fix(posts): normalize PostDate to yyyy-MM-dd HH:mm:ss GMT

Text-file exports can carry RFC 1123 dates ("Fri, 14 Feb 2025 15:20:09 GMT"),
which sort on the weekday name and fall outside --fromDate/--toDate
comparisons. PostDates.Normalize converts them on every PostDate write path
(AddPost, UpsertPostFromTextFile, UpdatePostContentFields).
normalize-postdate.sql fixes the 4 existing rows.

Co-Authored-By: Claude Opus 5 <[email protected]>

URLNotesGrabberCORE/DataAccess.cs

@@ -597,6 +597,7 @@ namespace URLNotesGrabberCORE
         {
             DBPath ??= GetDefaultDbPath();
             postType = PostTypes.Normalize(postType);
+            postDate = PostDates.Normalize(postDate)!;
             try { AddBlog(blogName, byLikes, DBPath); } catch { }
             try { UpdatePostSetDate(blogName, postID, postDate, DBPath); } catch { }
             try { UpdatePost(blogName, postID, reblogURL, postDate, postURL, slug, reblogKey, reblogName, summary, quote, body, tags, link, photoURL, photoCaption, downloadedFiles, audioCaption, question, answer, title, hasImage, byLikes, DBPath, rootBlogName, rootURL, postType); } catch { }
@@ -2249,6 +2250,7 @@ namespace URLNotesGrabberCORE
             // column. PostType is used as an output filename, so this is the invariant that keeps
             // a stray value from becoming a stray file.
             postType = PostTypes.Normalize(postType);
+            postDate = PostDates.Normalize(postDate);
             try { AddBlog(blogName, false, DBPath); } catch { }
 
             SQLiteConnection connection;
@@ -2620,10 +2622,11 @@ namespace URLNotesGrabberCORE
                 if (string.IsNullOrWhiteSpace(kvp.Value)) continue;
                 string? column = MapPrefixToColumn(kvp.Key);
                 if (column == null) continue;
+                string value = column == "PostDate" ? PostDates.Normalize(kvp.Value)! : kvp.Value;
                 string paramName = "@p" + parameters.Count;
                 setClauses.Add($"{column} = {paramName}");
                 changedClauses.Add($"IFNULL({column}, '') <> {paramName}");
-                parameters.Add((paramName, kvp.Value));
+                parameters.Add((paramName, value));
             }
 
             if (setClauses.Count == 0) return false;

URLNotesGrabberCORE/PostDates.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Globalization;
+
+namespace URLNotesGrabberCORE
+{
+    /// <summary>
+    /// The single format for Posts.PostDate: "yyyy-MM-dd HH:mm:ss GMT", which is what the
+    /// Tumblr API sends and what nearly every row holds. Text-file exports can carry the
+    /// RFC 1123 form ("Fri, 14 Feb 2025 15:20:09 GMT") instead, which as text sorts on its
+    /// weekday name and falls outside every --fromDate/--toDate range comparison.
+    ///
+    /// Every path that writes PostDate routes through <see cref="Normalize"/>. Only the RFC 1123
+    /// form is rewritten; anything else, including the "." no-change sentinel, passes through.
+    /// </summary>
+    public static class PostDates
+    {
+        public static string? Normalize(string? value)
+        {
+            if (string.IsNullOrWhiteSpace(value)) return value;
+            string trimmed = value.Trim();
+            if (DateTime.TryParseExact(trimmed, "r", CultureInfo.InvariantCulture,
+                    DateTimeStyles.AdjustToUniversal | DateTimeStyles.AssumeUniversal, out DateTime parsed))
+                return parsed.ToString("yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture) + " GMT";
+            return value;
+        }
+    }
+}

URLNotesGrabberCORE/TL.db.md

@@ -154,6 +154,10 @@ Notable:
   on every row, and something has since started writing it. Anything that treated it as
   permanently unset, or derived the type from post content instead, should be re-examined
   against the live data. Rolodex still derives it.
+- **`PostDate` is `yyyy-MM-dd HH:mm:ss GMT`** — UTC, as the Tumblr API sends it, unlike
+  the local-time `DateCreated`/`DateModified`. Text-file exports may carry RFC 1123
+  (`Fri, 14 Feb 2025 15:20:09 GMT`); every write path runs `PostDates.Normalize` to
+  convert it, and `../normalize-postdate.sql` fixed the 4 rows written before that.
 - `HasImage = 1` on 14,026 rows. It records that the post *had* a picture, not that a
   usable URL was kept, so it is not a reliable predictor that anything will render.
 - `PhotoURL` is largely unused; in practice the image markup lives inside `Body`.