diff --git a/core.go b/core.go
index 3eba7f1..75bb1a8 100644
--- a/core.go
+++ b/core.go
@@ -2,11 +2,13 @@ package time_arrow
 
 import (
 	"fmt"
-	"github.com/google/uuid"
 	"log"
 	"sort"
 	"strings"
+	"sync"
 	"time"
+
+	"github.com/google/uuid"
 )
 
 type TimeArrowType string
@@ -116,10 +118,27 @@ func isInDayOfMonth(t time.Time, ta TimeArrow) bool {
 	return false
 }
 
+var isInTimeOfDayCacheBool sync.Map
+
 func isInTimeOfDay(t time.Time, ta TimeArrow) bool {
+
 	if len(ta.TimesOnDay) == 0 {
 		return true
 	}
+
+	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.(bool)
+		if ok {
+			return ret
+		}
+	}
+
+	parseInLocationCache := map[string]time.Time{}
+	var err error
 	for k := range ta.TimesOnDay {
 		tsp := strings.Split(ta.TimesOnDay[k], "-")
 		if len(tsp) < 2 {
@@ -128,20 +147,44 @@ func isInTimeOfDay(t time.Time, ta TimeArrow) bool {
 		}
 
 		start, end := tsp[0], tsp[1]
+
 		start = timeCompletion(start)
 		end = timeCompletion(end)
-		startTime, err := time.ParseInLocation("2006-01-02 15:04:05", fmt.Sprintf("%s %s", t.Format("2006-01-02"), start), time.Local)
-		if err != nil {
-			log.Println("时间段开始时间格式错误", start)
-			continue
+
+		startTimeKey := fmt.Sprintf("%s %s", tfdate, start)
+		startTime, ok := parseInLocationCache[startTimeKey]
+		if !ok {
+			startTime, err = time.ParseInLocation("2006-01-02 15:04:05", startTimeKey, time.Local)
+			parseInLocationCache[startTimeKey] = startTime
+			if err != nil {
+				log.Println("时间段开始时间格式错误", start)
+				continue
+			}
+		} else {
+			if startTime.IsZero() {
+				log.Println("时间段开始时间格式错误", start)
+				continue
+			}
 		}
+
 		if end == "24" || end == "24:00" || end == "24:00:00" {
 			end = "23:59:59"
 		}
-		endTime, err := time.ParseInLocation("2006-01-02 15:04:05", fmt.Sprintf("%s %s", t.Format("2006-01-02"), end), time.Local)
-		if err != nil {
-			log.Println("时间段结束时间格式错误", end)
-			continue
+
+		endTimeKey := fmt.Sprintf("%s %s", tfdate, end)
+		endTime, ok := parseInLocationCache[endTimeKey]
+		if !ok {
+			endTime, err = time.ParseInLocation("2006-01-02 15:04:05", endTimeKey, time.Local)
+			parseInLocationCache[endTimeKey] = endTime
+			if err != nil {
+				log.Println("时间段结束时间格式错误", end)
+				continue
+			}
+		} else {
+			if endTime.IsZero() {
+				log.Println("时间段结束时间格式错误", end)
+				continue
+			}
 		}
 
 		if startTime.Unix() > endTime.Unix() {
@@ -150,9 +193,11 @@ func isInTimeOfDay(t time.Time, ta TimeArrow) bool {
 		}
 
 		if (t.After(startTime) || t.Equal(startTime)) && t.Before(endTime) {
+			isInTimeOfDayCacheBool.Store(mainKey, true)
 			return true
 		}
 	}
+	isInTimeOfDayCacheBool.Store(mainKey, false)
 	return false
 }