diff --git a/src/render/components/Clock.vue b/src/render/components/Clock.vue
index 8624297..60ae8f7 100644
--- a/src/render/components/Clock.vue
+++ b/src/render/components/Clock.vue
@@ -224,7 +224,7 @@ const update = (dateTime: Date) => {
 
   const second_data = seconds
   const minute_data = second_data / 60 + minutes
-  const hour_data   = minute_data / 60 + hours
+  const hour_data   = (minute_data / 60 + hours) % 12
 
   const value = {
     series: [