diff --git a/core.go b/core.go
index 75bb1a8..3eb5dc8 100644
--- a/core.go
+++ b/core.go
@@ -131,9 +131,14 @@ func isInTimeOfDay(t time.Time, ta TimeArrow) bool {
 	mainKey := fmt.Sprintf("[%s][%s]", tfdate, strings.Join(ta.TimesOnDay, "|"))
 	value, ok := isInTimeOfDayCacheBool.Load(mainKey)
 	if ok {
-		ret, ok := value.(bool)
+		ret, ok := value.(int)
 		if ok {
-			return ret
+			if ret == 1 {
+				return true
+			}
+			if ret == 2 {
+				return false
+			}
 		}
 	}
 
@@ -193,11 +198,11 @@ func isInTimeOfDay(t time.Time, ta TimeArrow) bool {
 		}
 
 		if (t.After(startTime) || t.Equal(startTime)) && t.Before(endTime) {
-			isInTimeOfDayCacheBool.Store(mainKey, true)
+			isInTimeOfDayCacheBool.Store(mainKey, 1)
 			return true
 		}
 	}
-	isInTimeOfDayCacheBool.Store(mainKey, false)
+	isInTimeOfDayCacheBool.Store(mainKey, 2)
 	return false
 }