diff --git a/src/GreenHome.Infrastructure/Services/PowerOutage/PowerOutageLogService.cs b/src/GreenHome.Infrastructure/Services/PowerOutage/PowerOutageLogService.cs
index b19e0d0..cbd5024 100644
--- a/src/GreenHome.Infrastructure/Services/PowerOutage/PowerOutageLogService.cs
+++ b/src/GreenHome.Infrastructure/Services/PowerOutage/PowerOutageLogService.cs
@@ -16,7 +16,10 @@ public sealed class PowerOutageLogService : IPowerOutageLogService
 
     public async Task LogPowerChangeAsync(int deviceId, byte previousPower, byte currentPower, DateTime timestampUtc, CancellationToken cancellationToken)
     {
-        var (year, month, day, persianDate) = timestampUtc.ToPersianDate();
+        // derive the Persian date from the naive-UTC wall-clock, not the machine-local time,
+        // so it does not shift with the server timezone (same rule as TelemetryService).
+        var (year, month, day, persianDate) =
+            DateTime.SpecifyKind(timestampUtc, DateTimeKind.Unspecified).ToPersianDate();
 
         var log = new Domain.PowerOutageLog
         {
@@ -133,7 +136,8 @@ public sealed class PowerOutageLogService : IPowerOutageLogService
                 if (previousLog != null && previousLog.CurrentPower != record.Power)
                 {
                     // Power status changed - insert a log
-                    var (year, month, day, persianDate) = record.TimestampUtc.ToPersianDate();
+                    var (year, month, day, persianDate) =
+                        DateTime.SpecifyKind(record.TimestampUtc, DateTimeKind.Unspecified).ToPersianDate();
 
                     var log = new Domain.PowerOutageLog
                     {