Fix: Prevent unwanted automatic updates to publishDate field on save

Co-authored-by: estruyf <2900833+estruyf@users.noreply.github.com>

src/helpers/ArticleHelper.ts

@@ -502,7 +502,9 @@ export class ArticleHelper {
    */
   public static async updateDates(article: ParsedFrontMatter) {
     const contentType = await ArticleHelper.getContentType(article);
-    const dateFields = contentType.fields.filter((field) => field.type === 'datetime');
+    const dateFields = contentType.fields.filter(
+      (field) => field.type === 'datetime' && !field.isPublishDate
+    );
 
     for (const dateField of dateFields) {
       if (article?.data[dateField.name]) {

src/parsers/ParserEngines.ts

@@ -40,7 +40,10 @@ export const Engines = {
         return toml.parse(value);
       },
       stringify: (value: any) => {
-        return toml.stringify(value);
+        const result = toml.stringify(value);
+        // Preserve the original datetime format by removing unnecessary zero milliseconds
+        // e.g. 2025-09-12T10:00:00.000Z -> 2025-09-12T10:00:00Z
+        return result.replace(/(\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2})\.000([Z+-][\d:]*)?\b/g, '$1$2');
       }
     },
     yaml: {