diff --git a/src/index.js b/src/index.js
index a833b02..5fad040 100644
--- a/src/index.js
+++ b/src/index.js
@@ -12,6 +12,8 @@ const taipeiFormatter = new Intl.DateTimeFormat('en-CA', {
 });
 
 let currentStage = '';
+let cachedTimestampKey = '';
+let cachedTimestampValue = '';
 
 /**
  * 格式化台灣時區時間，供 log 使用。
@@ -20,6 +22,11 @@ let currentStage = '';
  * @returns {string} `yyyy/MM/dd HH:mm:ss` 格式時間字串。
  */
 function formatTaipeiTimestamp(date = new Date()) {
+  const timestampKey = date.toISOString().slice(0, 19);
+  if (timestampKey === cachedTimestampKey) {
+    return cachedTimestampValue;
+  }
+
   const parts = taipeiFormatter.formatToParts(date);
 
   const lookup = {};
@@ -29,7 +36,9 @@ function formatTaipeiTimestamp(date = new Date()) {
     }
   }
 
-  return `${lookup.year}/${lookup.month}/${lookup.day} ${lookup.hour}:${lookup.minute}:${lookup.second}`;
+  cachedTimestampKey = timestampKey;
+  cachedTimestampValue = `${lookup.year}/${lookup.month}/${lookup.day} ${lookup.hour}:${lookup.minute}:${lookup.second}`;
+  return cachedTimestampValue;
 }
 
 /**
@@ -348,6 +357,10 @@ async function main() {
     });
   }
 
+  if (hadFailure) {
+    throw new Error('至少有一筆 release 或 tag 刪除失敗');
+  }
+
   section('刪除未指定 release 的 tag');
 
   const releaseTags = new Set(
@@ -388,9 +401,6 @@ async function main() {
     }
   });
 
-  if (hadFailure) {
-    throw new Error('至少有一筆 release 或 tag 刪除失敗');
-  }
 }
 
 main().catch((error) => {