diff --git a/src/utils/format-duration.ts b/src/utils/format-duration.ts
index 283ab30..4cd9015 100644
--- a/src/utils/format-duration.ts
+++ b/src/utils/format-duration.ts
@@ -7,8 +7,8 @@ export const formatDuration = (startTime?: string, endTime?: string) => {
   if (!startTime || !endTime) return '';
   const start = dayjs(startTime);
   const end = dayjs(endTime);
-  const diffMillis = end.diff(start, 'second');
-  const duration = dayjs.duration(Math.abs(diffMillis), 'second');
+  const diffSeconds = end.diff(start, 'second');
+  const duration = dayjs.duration(Math.abs(diffSeconds), 'second');
   const d = Math.floor(duration.asDays());
   const h = duration.hours();
   const m = duration.minutes();
@@ -18,5 +18,5 @@ export const formatDuration = (startTime?: string, endTime?: string) => {
   if (h > 0) result += `${h}小时`;
   if (m > 0) result += `${m}分钟`;
   if (s > 0) result += `${s}秒`;
-  return diffMillis < 0 ? `-${result}` : result;
+  return diffSeconds < 0 ? `-${result}` : result;
 };