diff --git a/src/utils/postFilter.ts b/src/utils/postFilter.ts
index a2e4682cbb..d4c75c8b18 100644
--- a/src/utils/postFilter.ts
+++ b/src/utils/postFilter.ts
@@ -1,16 +1,18 @@
 import type { CollectionEntry } from "astro:content";
+import dayjs from "dayjs";
+import utc from "dayjs/plugin/utc";
+import timezone from "dayjs/plugin/timezone";
 import config from "@/config";
 
-/**
- * Determines whether a post is eligible to be listed/rendered.
- *
- * - Excludes drafts always
- * - In production, excludes scheduled posts until `pubDatetime` minus the configured margin
- * - In dev, always shows non-draft posts to make authoring easier
- */
+dayjs.extend(utc);
+dayjs.extend(timezone);
+
 export function postFilter({ data }: CollectionEntry<"posts">) {
+  const tz = data.timezone ?? config.site.timezone;
+  // Interpret the date in the site's timezone instead of UTC, so that
+  // pubDatetime: 2026-06-28 means "June 28 in Shanghai" not "June 28 UTC".
+  const publishTime = dayjs.utc(data.pubDatetime).tz(tz, true);
   const isPublishTimePassed =
-    Date.now() >
-    new Date(data.pubDatetime).getTime() - config.posts.scheduledPostMargin;
+    Date.now() > publishTime.valueOf() - config.posts.scheduledPostMargin;
   return !data.draft && (import.meta.env.DEV || isPublishTimePassed);
 }