diff --git a/core.go b/core.go
index 1347358..fc3cbdd 100644
--- a/core.go
+++ b/core.go
@@ -1,6 +1,7 @@
 package time_arrow
 
 import (
+	"encoding/json"
 	"fmt"
 	"log"
 	"sort"
@@ -128,19 +129,21 @@ func isInTimeOfDay(t time.Time, ta TimeArrow) bool {
 
 	tfdate := t.Format("2006-01-02")
 
-	mainKey := fmt.Sprintf("[%s][%s]", tfdate, strings.Join(ta.TimesOnDay, "|"))
-	// value, ok := isInTimeOfDayCacheBool.Load(mainKey)
-	// if ok {
-	// ret, ok := value.(int)
-	// if ok {
-	// 	if ret == 1 {
-	// 		return true
-	// 	}
-	// 	if ret == 2 {
-	// 		return false
-	// 	}
-	// }
-	// }
+	tmp, _ := json.Marshal(ta.TimesOnDay)
+	mainKey := fmt.Sprintf("[%s][%s]", tfdate, string(tmp))
+
+	value, ok := isInTimeOfDayCacheBool.Load(mainKey)
+	if ok {
+		ret, ok := value.(int)
+		if ok {
+			if ret == 1 {
+				return true
+			}
+			if ret == 2 {
+				return false
+			}
+		}
+	}
 
 	parseInLocationCache := map[string]time.Time{}
 	var err error
@@ -158,7 +161,7 @@ func isInTimeOfDay(t time.Time, ta TimeArrow) bool {
 
 		startTimeKey := fmt.Sprintf("%s %s", tfdate, start)
 		startTime, ok := parseInLocationCache[startTimeKey]
-		if false && !ok {
+		if !ok {
 			startTime, err = time.ParseInLocation("2006-01-02 15:04:05", startTimeKey, time.Local)
 			parseInLocationCache[startTimeKey] = startTime
 			if err != nil {
@@ -178,7 +181,7 @@ func isInTimeOfDay(t time.Time, ta TimeArrow) bool {
 
 		endTimeKey := fmt.Sprintf("%s %s", tfdate, end)
 		endTime, ok := parseInLocationCache[endTimeKey]
-		if false && !ok {
+		if !ok {
 			endTime, err = time.ParseInLocation("2006-01-02 15:04:05", endTimeKey, time.Local)
 			parseInLocationCache[endTimeKey] = endTime
 			if err != nil {