diff --git a/adapter/router.go b/adapter/router.go
index 164a8dd3..ec23d931 100644
--- a/adapter/router.go
+++ b/adapter/router.go
@@ -46,8 +46,6 @@ type Router interface {
 	PackageManager() tun.PackageManager
 	Rules() []Rule
 
-	TimeService
-
 	ClashServer() ClashServer
 	SetClashServer(server ClashServer)
 
diff --git a/inbound/shadowsocks.go b/inbound/shadowsocks.go
index c3318789..822a5f57 100644
--- a/inbound/shadowsocks.go
+++ b/inbound/shadowsocks.go
@@ -16,6 +16,7 @@ import (
 	"github.com/sagernet/sing/common/buf"
 	E "github.com/sagernet/sing/common/exceptions"
 	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/common/ntp"
 )
 
 func NewShadowsocks(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.ShadowsocksInboundOptions) (adapter.Inbound, error) {
@@ -68,7 +69,7 @@ func newShadowsocks(ctx context.Context, router adapter.Router, logger log.Conte
 	case common.Contains(shadowaead.List, options.Method):
 		inbound.service, err = shadowaead.NewService(options.Method, nil, options.Password, udpTimeout, inbound.upstreamContextHandler())
 	case common.Contains(shadowaead_2022.List, options.Method):
-		inbound.service, err = shadowaead_2022.NewServiceWithPassword(options.Method, options.Password, udpTimeout, inbound.upstreamContextHandler(), router.TimeFunc())
+		inbound.service, err = shadowaead_2022.NewServiceWithPassword(options.Method, options.Password, udpTimeout, inbound.upstreamContextHandler(), ntp.TimeFuncFromContext(ctx))
 	default:
 		err = E.New("unsupported method: ", options.Method)
 	}
diff --git a/inbound/shadowsocks_multi.go b/inbound/shadowsocks_multi.go
index 3a998e36..6a1baac2 100644
--- a/inbound/shadowsocks_multi.go
+++ b/inbound/shadowsocks_multi.go
@@ -18,6 +18,7 @@ import (
 	E "github.com/sagernet/sing/common/exceptions"
 	F "github.com/sagernet/sing/common/format"
 	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/common/ntp"
 )
 
 var (
@@ -61,7 +62,7 @@ func newShadowsocksMulti(ctx context.Context, router adapter.Router, logger log.
 			options.Password,
 			udpTimeout,
 			adapter.NewUpstreamContextHandler(inbound.newConnection, inbound.newPacketConnection, inbound),
-			router.TimeFunc(),
+			ntp.TimeFuncFromContext(ctx),
 		)
 	} else if common.Contains(shadowaead.List, options.Method) {
 		service, err = shadowaead.NewMultiService[int](
diff --git a/inbound/vmess.go b/inbound/vmess.go
index e65c05a0..89f938fc 100644
--- a/inbound/vmess.go
+++ b/inbound/vmess.go
@@ -19,6 +19,7 @@ import (
 	F "github.com/sagernet/sing/common/format"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/common/ntp"
 )
 
 var (
@@ -50,7 +51,7 @@ func NewVMess(ctx context.Context, router adapter.Router, logger log.ContextLogg
 		users: options.Users,
 	}
 	var serviceOptions []vmess.ServiceOption
-	if timeFunc := router.TimeFunc(); timeFunc != nil {
+	if timeFunc := ntp.TimeFuncFromContext(ctx); timeFunc != nil {
 		serviceOptions = append(serviceOptions, vmess.ServiceWithTimeFunc(timeFunc))
 	}
 	if options.Transport != nil && options.Transport.Type != "" {
diff --git a/ntp/service.go b/ntp/service.go
index 3ca1de3c..47f84dfc 100644
--- a/ntp/service.go
+++ b/ntp/service.go
@@ -18,7 +18,7 @@ import (
 	"github.com/sagernet/sing/common/ntp"
 )
 
-var _ adapter.TimeService = (*Service)(nil)
+var _ ntp.TimeService = (*Service)(nil)
 
 type Service struct {
 	ctx           context.Context
diff --git a/outbound/vmess.go b/outbound/vmess.go
index 48c9d818..a981464b 100644
--- a/outbound/vmess.go
+++ b/outbound/vmess.go
@@ -18,6 +18,7 @@ import (
 	E "github.com/sagernet/sing/common/exceptions"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/common/ntp"
 )
 
 var _ adapter.Outbound = (*VMess)(nil)
@@ -77,7 +78,7 @@ func NewVMess(ctx context.Context, router adapter.Router, logger log.ContextLogg
 		return nil, E.New("unknown packet encoding: ", options.PacketEncoding)
 	}
 	var clientOptions []vmess.ClientOption
-	if timeFunc := router.TimeFunc(); timeFunc != nil {
+	if timeFunc := ntp.TimeFuncFromContext(ctx); timeFunc != nil {
 		clientOptions = append(clientOptions, vmess.ClientWithTimeFunc(timeFunc))
 	}
 	if options.GlobalPadding {
diff --git a/route/router.go b/route/router.go
index cb1bd366..c34c5368 100644
--- a/route/router.go
+++ b/route/router.go
@@ -81,7 +81,7 @@ type Router struct {
 	interfaceMonitor                   tun.DefaultInterfaceMonitor
 	packageManager                     tun.PackageManager
 	processSearcher                    process.Searcher
-	timeService                        adapter.TimeService
+	timeService                        *ntp.Service
 	pauseManager                       pause.Manager
 	clashServer                        adapter.ClashServer
 	v2rayServer                        adapter.V2RayServer
@@ -950,13 +950,6 @@ func (r *Router) PackageManager() tun.PackageManager {
 	return r.packageManager
 }
 
-func (r *Router) TimeFunc() func() time.Time {
-	if r.timeService == nil {
-		return nil
-	}
-	return r.timeService.TimeFunc()
-}
-
 func (r *Router) ClashServer() adapter.ClashServer {
 	return r.clashServer
 }