diff --git a/.github/workflows/daily-maintenance.yml b/.github/workflows/daily-maintenance.yml
index c8c5ac4b..4272cba3 100644
--- a/.github/workflows/daily-maintenance.yml
+++ b/.github/workflows/daily-maintenance.yml
@@ -30,13 +30,13 @@ jobs:
           if [ -f "$CACHE_FILE" ]; then
             CACHE_DATE=$(jq -r '.date // ""' "$CACHE_FILE" 2>/dev/null || echo "")
             if [ "$CACHE_DATE" != "$TODAY" ]; then
-              echo '{"date":"","records":[]}' > "$CACHE_FILE"
+              echo "{\"date\":\"$TODAY\",\"records\":[]}" > "$CACHE_FILE"
               echo "✅ 公告栏缓存已清空（旧日期: $CACHE_DATE）"
             else
               echo "📌 公告栏缓存日期匹配今天 ($TODAY)，无需清空"
             fi
           else
-            echo '{"date":"","records":[]}' > "$CACHE_FILE"
+            echo "{\"date\":\"$TODAY\",\"records\":[]}" > "$CACHE_FILE"
             echo "✅ 创建新的公告栏缓存文件"
           fi
 
diff --git a/scripts/update-readme-bulletin.js b/scripts/update-readme-bulletin.js
index 5f6d166e..5dbcdd6d 100644
--- a/scripts/update-readme-bulletin.js
+++ b/scripts/update-readme-bulletin.js
@@ -194,7 +194,7 @@ function appendToCache(cache, newEntries) {
   const existingKeys = new Set(cache.records.map(r => r.key));
   let added = 0;
   for (const e of newEntries) {
-    const key = `${e.actor}|${e.module || '—'}|${formatTimeShort(e.ts)}`;
+    const key = `${e.actor}|${e.module || '—'}|${e.ts || ''}`;
     if (!existingKeys.has(key)) {
       existingKeys.add(key);
       cache.records.push({