diff --git a/GUI/PlotPanel.cs b/GUI/PlotPanel.cs
index a6f37c9..1ab4a49 100644
--- a/GUI/PlotPanel.cs
+++ b/GUI/PlotPanel.cs
@@ -155,7 +155,7 @@ namespace OpenHardwareMonitor.GUI {
     }
 
     protected override void OnPaint(PaintEventArgs e) {
-      now = DateTime.Now - new TimeSpan(0, 0, 4);
+      now = DateTime.UtcNow - new TimeSpan(0, 0, 4);
 
       List<float> timeGrid = GetTimeGrid();
       List<float> tempGrid = GetTemperatureGrid();
diff --git a/Hardware/Sensor.cs b/Hardware/Sensor.cs
index 9c8e175..10e52f1 100644
--- a/Hardware/Sensor.cs
+++ b/Hardware/Sensor.cs
@@ -134,7 +134,7 @@ namespace OpenHardwareMonitor.Hardware {
         }
       } catch { }
       if (values.Count > 0)
-        AppendValue(float.NaN, DateTime.Now);
+        AppendValue(float.NaN, DateTime.UtcNow);
     }
 
     private void AppendValue(float value, DateTime time) {
@@ -193,7 +193,7 @@ namespace OpenHardwareMonitor.Hardware {
         return currentValue; 
       }
       set {
-        DateTime now = DateTime.Now;
+        DateTime now = DateTime.UtcNow;
         while (values.Count > 0 && (now - values.First.Time).TotalDays > 1)
           values.Remove();