diff --git a/ntp/service.go b/ntp/service.go
deleted file mode 100644
index 70a41c0e..00000000
--- a/ntp/service.go
+++ /dev/null
@@ -1,112 +0,0 @@
-package ntp
-
-import (
-	"context"
-	"os"
-	"time"
-
-	"github.com/sagernet/sing-box/adapter"
-	"github.com/sagernet/sing-box/common/dialer"
-	"github.com/sagernet/sing-box/common/settings"
-	C "github.com/sagernet/sing-box/constant"
-	"github.com/sagernet/sing-box/option"
-	"github.com/sagernet/sing/common"
-	E "github.com/sagernet/sing/common/exceptions"
-	"github.com/sagernet/sing/common/logger"
-	M "github.com/sagernet/sing/common/metadata"
-	N "github.com/sagernet/sing/common/network"
-	"github.com/sagernet/sing/common/ntp"
-)
-
-var _ ntp.TimeService = (*Service)(nil)
-
-type Service struct {
-	ctx           context.Context
-	cancel        common.ContextCancelCauseFunc
-	server        M.Socksaddr
-	writeToSystem bool
-	dialer        N.Dialer
-	logger        logger.Logger
-	ticker        *time.Ticker
-	clockOffset   time.Duration
-}
-
-func NewService(ctx context.Context, router adapter.Router, logger logger.Logger, options option.NTPOptions) (*Service, error) {
-	ctx, cancel := common.ContextWithCancelCause(ctx)
-	server := M.ParseSocksaddrHostPort(options.Server, options.ServerPort)
-	if server.Port == 0 {
-		server.Port = 123
-	}
-	var interval time.Duration
-	if options.Interval > 0 {
-		interval = time.Duration(options.Interval)
-	} else {
-		interval = 30 * time.Minute
-	}
-	outboundDialer, err := dialer.New(router, options.DialerOptions)
-	if err != nil {
-		return nil, err
-	}
-	return &Service{
-		ctx:           ctx,
-		cancel:        cancel,
-		server:        server,
-		writeToSystem: options.WriteToSystem,
-		dialer:        outboundDialer,
-		logger:        logger,
-		ticker:        time.NewTicker(interval),
-	}, nil
-}
-
-func (s *Service) Start() error {
-	err := s.update()
-	if err != nil {
-		return E.Cause(err, "initialize time")
-	}
-	s.logger.Info("updated time: ", s.TimeFunc()().Local().Format(C.TimeLayout))
-	go s.loopUpdate()
-	return nil
-}
-
-func (s *Service) Close() error {
-	s.ticker.Stop()
-	s.cancel(os.ErrClosed)
-	return nil
-}
-
-func (s *Service) TimeFunc() func() time.Time {
-	return func() time.Time {
-		return time.Now().Add(s.clockOffset)
-	}
-}
-
-func (s *Service) loopUpdate() {
-	for {
-		select {
-		case <-s.ctx.Done():
-			return
-		case <-s.ticker.C:
-		}
-		err := s.update()
-		if err == nil {
-			s.logger.Debug("updated time: ", s.TimeFunc()().Local().Format(C.TimeLayout))
-		} else {
-			s.logger.Warn("update time: ", err)
-		}
-	}
-}
-
-func (s *Service) update() error {
-	response, err := ntp.Exchange(s.ctx, s.dialer, s.server)
-	if err != nil {
-		return err
-	}
-	s.clockOffset = response.ClockOffset
-	if s.writeToSystem {
-		writeErr := settings.SetSystemTime(s.TimeFunc()())
-		if writeErr != nil {
-			s.logger.Warn("write time to system: ", writeErr)
-		}
-	}
-	return nil
-}
diff --git a/option/ntp.go b/option/ntp.go
index 000a658c..0bd2489a 100644
--- a/option/ntp.go
+++ b/option/ntp.go
@@ -2,9 +2,8 @@ package option
 
 type NTPOptions struct {
 	Enabled       bool     `json:"enabled,omitempty"`
-	Server        string   `json:"server,omitempty"`
-	ServerPort    uint16   `json:"server_port,omitempty"`
 	Interval      Duration `json:"interval,omitempty"`
 	WriteToSystem bool     `json:"write_to_system,omitempty"`
+	ServerOptions
 	DialerOptions
 }
diff --git a/route/router.go b/route/router.go
index fa602989..15d8ef10 100644
--- a/route/router.go
+++ b/route/router.go
@@ -23,7 +23,6 @@ import (
 	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing-box/experimental/libbox/platform"
 	"github.com/sagernet/sing-box/log"
-	"github.com/sagernet/sing-box/ntp"
 	"github.com/sagernet/sing-box/option"
 	"github.com/sagernet/sing-box/outbound"
 	"github.com/sagernet/sing-box/transport/fakeip"
@@ -40,7 +39,7 @@ import (
 	F "github.com/sagernet/sing/common/format"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
-	serviceNTP "github.com/sagernet/sing/common/ntp"
+	"github.com/sagernet/sing/common/ntp"
 	"github.com/sagernet/sing/common/task"
 	"github.com/sagernet/sing/common/uot"
 	"github.com/sagernet/sing/common/winpowrprof"
@@ -333,11 +332,19 @@ func NewRouter(
 	}
 
 	if ntpOptions.Enabled {
-		timeService, err := ntp.NewService(ctx, router, logFactory.NewLogger("ntp"), ntpOptions)
+		ntpDialer, err := dialer.New(router, ntpOptions.DialerOptions)
 		if err != nil {
-			return nil, err
+			return nil, E.Cause(err, "create NTP service")
 		}
-		service.ContextWith[serviceNTP.TimeService](ctx, timeService)
+		timeService := ntp.NewService(ntp.Options{
+			Context:       ctx,
+			Dialer:        ntpDialer,
+			Logger:        logFactory.NewLogger("ntp"),
+			Server:        ntpOptions.ServerOptions.Build(),
+			Interval:      time.Duration(ntpOptions.Interval),
+			WriteToSystem: ntpOptions.WriteToSystem,
+		})
+		service.MustRegister[ntp.TimeService](ctx, timeService)
 		router.timeService = timeService
 	}
 	return router, nil