diff --git a/lib/utils/wbi_sign.dart b/lib/utils/wbi_sign.dart
index 57bf60c9d..adf41316b 100644
--- a/lib/utils/wbi_sign.dart
+++ b/lib/utils/wbi_sign.dart
@@ -86,7 +86,7 @@ abstract final class WbiSign {
 
       _localCache
         ..put(LocalCacheKey.mixinKey, mixinKey)
-        ..put(LocalCacheKey.timeStamp, DateTime.now().millisecondsSinceEpoch);
+        ..put(LocalCacheKey.timeStamp, nowDate.millisecondsSinceEpoch);
 
       return mixinKey;
     } catch (_) {