diff --git a/Dolphin.ExamPictureCut.Application/Exams/ExamManager.cs b/Dolphin.ExamPictureCut.Application/Exams/ExamManager.cs
index 66bc4ce..a746980 100644
--- a/Dolphin.ExamPictureCut.Application/Exams/ExamManager.cs
+++ b/Dolphin.ExamPictureCut.Application/Exams/ExamManager.cs
@@ -70,7 +70,7 @@ public class ExamManager : DomainService, IExamManager
         var paperIds = templates.Select(s => s.PaperId).ToList();
 
         // 获取点阵数据
-        var timespan = (long)(eto.LastCollectTime - new DateTime(1970, 1, 1, 0, 0, 0)).TotalMilliseconds;
+        var timespan = (long)(eto.LastCollectTime - TimeZoneInfo.ConvertTimeFromUtc(new DateTime(1970, 1, 1), TimeZoneInfo.Local)).TotalMilliseconds;
         var lattices = await DbPenOffline.Queryable<PenOfflineData>()
             .Where(w => w.PenSerial == penSerial && paperIds.Contains(w.PageSerial) && w.logType == LogType.作业 && w.Time <= timespan)
             .Select(s => new PenOfflineData