diff --git a/Ink Canvas/Windows/FullscreenTimerWindow.xaml.cs b/Ink Canvas/Windows/FullscreenTimerWindow.xaml.cs
index 7221e64e..cee0ce8a 100644
--- a/Ink Canvas/Windows/FullscreenTimerWindow.xaml.cs	
+++ b/Ink Canvas/Windows/FullscreenTimerWindow.xaml.cs	
@@ -125,9 +125,8 @@ namespace Ink_Canvas
                     seconds = timeSpan.Seconds;
                 }
 
-                // 更新小时显示
-                SetDigitDisplay("FullHour1Display", hours / 10, shouldShowRed);
-                SetDigitDisplay("FullHour2Display", hours % 10, shouldShowRed);
+                SetDigitDisplay("FullHour1Display", Math.Abs(hours / 10) % 10, shouldShowRed);
+                SetDigitDisplay("FullHour2Display", (hours % 10 + 10) % 10, shouldShowRed);
                 
                 // 更新分钟显示
                 SetDigitDisplay("FullMinute1Display", minutes / 10, shouldShowRed);
diff --git a/Ink Canvas/Windows/MinimizedTimerWindow.xaml.cs b/Ink Canvas/Windows/MinimizedTimerWindow.xaml.cs
index 50731801..10b8a3aa 100644
--- a/Ink Canvas/Windows/MinimizedTimerWindow.xaml.cs	
+++ b/Ink Canvas/Windows/MinimizedTimerWindow.xaml.cs	
@@ -169,9 +169,8 @@ namespace Ink_Canvas
                     seconds = timeSpan.Seconds;
                 }
 
-                // 更新小时显示
-                SetDigitDisplay("MinHour1Display", hours / 10, shouldShowRed);
-                SetDigitDisplay("MinHour2Display", hours % 10, shouldShowRed);
+                SetDigitDisplay("MinHour1Display", Math.Abs(hours / 10) % 10, shouldShowRed);
+                SetDigitDisplay("MinHour2Display", (hours % 10 + 10) % 10, shouldShowRed);
                 
                 // 更新分钟显示
                 SetDigitDisplay("MinMinute1Display", minutes / 10, shouldShowRed);
diff --git a/Ink Canvas/Windows/NewStyleTimerWindow.cs b/Ink Canvas/Windows/NewStyleTimerWindow.cs
index 7c6dcbb0..a46dae48 100644
--- a/Ink Canvas/Windows/NewStyleTimerWindow.cs	
+++ b/Ink Canvas/Windows/NewStyleTimerWindow.cs	
@@ -130,8 +130,8 @@ namespace Ink_Canvas
 
                     bool shouldShowRed = MainWindow.Settings.RandSettings?.EnableOvertimeRedText == true;
 
-                    SetDigitDisplay("Digit1Display", displayHours / 10, shouldShowRed);
-                    SetDigitDisplay("Digit2Display", displayHours % 10, shouldShowRed);
+                    SetDigitDisplay("Digit1Display", Math.Abs(displayHours / 10) % 10, shouldShowRed);
+                    SetDigitDisplay("Digit2Display", (displayHours % 10 + 10) % 10, shouldShowRed);
                     SetDigitDisplay("Digit3Display", overtimeSpan.Minutes / 10, shouldShowRed);
                     SetDigitDisplay("Digit4Display", overtimeSpan.Minutes % 10, shouldShowRed);
                     SetDigitDisplay("Digit5Display", overtimeSpan.Seconds / 10, shouldShowRed);