diff --git a/src/LiveRecorder.Application/Services/DashboardService.cs b/src/LiveRecorder.Application/Services/DashboardService.cs
index 681d9ba..789d97a 100644
--- a/src/LiveRecorder.Application/Services/DashboardService.cs
+++ b/src/LiveRecorder.Application/Services/DashboardService.cs
@@ -40,8 +40,10 @@ public sealed class DashboardService
         var now = DateTimeOffset.UtcNow;
         var beijingNow = ChinaTime.ToBeijingTime(now);
         var todayBeijingDate = DateOnly.FromDateTime(beijingNow.DateTime);
-        var todayUtcStart = new DateTimeOffset(todayBeijingDate.ToDateTime(TimeOnly.MinValue), ChinaTime.Zone.GetUtcOffset(beijingNow.DateTime));
-        var todayUtcEnd = new DateTimeOffset(todayBeijingDate.ToDateTime(TimeOnly.MaxValue), ChinaTime.Zone.GetUtcOffset(beijingNow.DateTime));
+        // Bound "today in Beijing" but normalize to UTC — Npgsql only accepts offset 0
+        // when writing to a `timestamp with time zone` column.
+        var todayUtcStart = new DateTimeOffset(todayBeijingDate.ToDateTime(TimeOnly.MinValue), ChinaTime.Zone.GetUtcOffset(beijingNow.DateTime)).ToUniversalTime();
+        var todayUtcEnd = new DateTimeOffset(todayBeijingDate.ToDateTime(TimeOnly.MaxValue), ChinaTime.Zone.GetUtcOffset(beijingNow.DateTime)).ToUniversalTime();
         var recentErrorSince = now.AddHours(-24);
 
         // Run queries sequentially — DbContext is not thread-safe