fix(rss): normalize pubDate to correct calendar date (#13)

Author: CalvinAllen

package-lock.json

@@ -2,6 +2,14 @@ import rss from '@astrojs/rss';
 import { getCollection } from 'astro:content';
 import type { APIContext } from 'astro';
 
+// Get the date portion in Eastern time and return a Date at noon UTC
+// This ensures the pubDate displays the correct calendar date regardless of timezone
+function normalizeDateForRss(date: Date): Date {
+  const eastern = date.toLocaleDateString('en-CA', { timeZone: 'America/New_York' });
+  const [year, month, day] = eastern.split('-').map(Number);
+  return new Date(Date.UTC(year, month - 1, day, 12, 0, 0));
+}
+
 export async function GET(context: APIContext) {
   const posts = await getCollection('blog');
   const sortedPosts = posts.sort((a, b) => b.data.date.getTime() - a.data.date.getTime());
@@ -14,7 +22,7 @@ export async function GET(context: APIContext) {
       const slug = post.id.split('/').pop() || post.id;
       return {
         title: post.data.title,
-        pubDate: post.data.date,
+        pubDate: normalizeDateForRss(post.data.date),
         description: post.data.description || '',
         link: `/${slug}/`,
         categories: post.data.categories,