diff --git a/sysutils.go b/sysutils.go
index 8697c14..1927f9d 100644
--- a/sysutils.go
+++ b/sysutils.go
@@ -1,6 +1,7 @@
 package f5
 
 import (
+	"q5"
 	"os"
 	"errors"
 	"gorm.io/gorm"
@@ -32,6 +33,14 @@ func New[T any](cb func(*T)) *T {
 	return obj
 }
 
+func ExtractRegisterTimeFromSessionid(sessionId string) int32 {
+	strList := q5.StrSplit(sessionId, "_")
+	if len(strList) < 4 {
+		return 0
+	}
+	return q5.ToInt32(strList[0])
+}
+
 func IsOrmErrRecordNotFound(err error) bool {
 	return errors.Is(err, gorm.ErrRecordNotFound)
 }