diff --git a/src/platform/esp32.rs b/src/platform/esp32.rs
index 01fb38f..f1e3e7b 100644
--- a/src/platform/esp32.rs
+++ b/src/platform/esp32.rs
@@ -273,9 +273,9 @@ impl CircadianRhythm {
             adjusted_end.hour += 24;
         }
 
-        let start_time = start.hour * 60;
-        let end_time = end.hour * 60;
-        let now_time = hour * 60 + minute;
+        let start_time = (start.hour as u16).wrapping_mul(60);
+        let end_time = (end.hour as u16).wrapping_mul(60);
+        let now_time = (hour as u16).wrapping_mul(60).wrapping_add(minute as u16);
 
         let duration = end_time - start_time;
         let cur_duration = now_time - start_time;