diff --git a/br/pkg/task/backup.go b/br/pkg/task/backup.go
index de94b2d385ad5..311f57e9de020 100644
--- a/br/pkg/task/backup.go
+++ b/br/pkg/task/backup.go
@@ -137,7 +137,7 @@ func (cfg *BackupConfig) ParseFromFlags(flags *pflag.FlagSet) error {
 	if err != nil {
 		return errors.Trace(err)
 	}
-	cfg.BackupTS, err = ParseTSString(backupTS)
+	cfg.BackupTS, err = ParseTSString(backupTS, false)
 	if err != nil {
 		return errors.Trace(err)
 	}
@@ -528,7 +528,7 @@ func RunBackup(c context.Context, g glue.Glue, cmdName string, cfg *BackupConfig
 }
 
 // ParseTSString port from tidb setSnapshotTS.
-func ParseTSString(ts string) (uint64, error) {
+func ParseTSString(ts string, tzCheck bool) (uint64, error) {
 	if len(ts) == 0 {
 		return 0, nil
 	}
@@ -540,6 +540,12 @@ func ParseTSString(ts string) (uint64, error) {
 	sc := &stmtctx.StatementContext{
 		TimeZone: loc,
 	}
+	if tzCheck {
+		tzIdx, _, _, _, _ := types.GetTimezone(ts)
+		if tzIdx < 0 {
+			return 0, errors.Errorf("must set timezone when using datetime format ts")
+		}
+	}
 	t, err := types.ParseTime(sc, ts, mysql.TypeTimestamp, types.MaxFsp)
 	if err != nil {
 		return 0, errors.Trace(err)
diff --git a/br/pkg/task/backup_test.go b/br/pkg/task/backup_test.go
index ef3f33d27ee54..25d6de8ee66fb 100644
--- a/br/pkg/task/backup_test.go
+++ b/br/pkg/task/backup_test.go
@@ -16,21 +16,40 @@ func TestParseTSString(t *testing.T) {
 		err error
 	)
 
-	ts, err = ParseTSString("")
+	ts, err = ParseTSString("", false)
 	require.NoError(t, err)
 	require.Zero(t, ts)
 
-	ts, err = ParseTSString("400036290571534337")
+	ts, err = ParseTSString("400036290571534337", false)
 	require.NoError(t, err)
 	require.Equal(t, uint64(400036290571534337), ts)
 
-	ts, err = ParseTSString("2021-01-01 01:42:23")
+	ts, err = ParseTSString("2021-01-01 01:42:23", false)
 	require.NoError(t, err)
 	localTime := time.Date(2021, time.Month(1), 1, 1, 42, 23, 0, time.Local)
-
 	localTimestamp := localTime.Unix()
 	localTSO := uint64((localTimestamp << 18) * 1000)
 	require.Equal(t, localTSO, ts)
+
+	_, err = ParseTSString("2021-01-01 01:42:23", true)
+	require.Error(t, err)
+	require.Regexp(t, "must set timezone*", err.Error())
+
+	ts, err = ParseTSString("2021-01-01 01:42:23+00:00", true)
+	require.NoError(t, err)
+	localTime = time.Date(2021, time.Month(1), 1, 1, 42, 23, 0, time.UTC)
+	localTimestamp = localTime.Unix()
+	localTSO = uint64((localTimestamp << 18) * 1000)
+	require.Equal(t, localTSO, ts)
+
+	ts, err = ParseTSString("2021-01-01 01:42:23+08:00", true)
+	require.NoError(t, err)
+	secondsEastOfUTC := int((8 * time.Hour).Seconds())
+	beijing := time.FixedZone("Beijing Time", secondsEastOfUTC)
+	localTime = time.Date(2021, time.Month(1), 1, 1, 42, 23, 0, beijing)
+	localTimestamp = localTime.Unix()
+	localTSO = uint64((localTimestamp << 18) * 1000)
+	require.Equal(t, localTSO, ts)
 }
 
 func TestParseCompressionType(t *testing.T) {
diff --git a/br/pkg/task/restore.go b/br/pkg/task/restore.go
index 1e6cbd2432065..d139d58a12186 100644
--- a/br/pkg/task/restore.go
+++ b/br/pkg/task/restore.go
@@ -182,14 +182,14 @@ func (cfg *RestoreConfig) ParseStreamRestoreFlags(flags *pflag.FlagSet) error {
 	if err != nil {
 		return errors.Trace(err)
 	}
-	if cfg.StartTS, err = ParseTSString(tsString); err != nil {
+	if cfg.StartTS, err = ParseTSString(tsString, true); err != nil {
 		return errors.Trace(err)
 	}
 	tsString, err = flags.GetString(FlagStreamRestoreTS)
 	if err != nil {
 		return errors.Trace(err)
 	}
-	if cfg.RestoreTS, err = ParseTSString(tsString); err != nil {
+	if cfg.RestoreTS, err = ParseTSString(tsString, true); err != nil {
 		return errors.Trace(err)
 	}
 
diff --git a/br/pkg/task/stream.go b/br/pkg/task/stream.go
index 7d8b717f07e0d..e3337cc49b039 100644
--- a/br/pkg/task/stream.go
+++ b/br/pkg/task/stream.go
@@ -189,7 +189,7 @@ func (cfg *StreamConfig) ParseStreamTruncateFromFlags(flags *pflag.FlagSet) erro
 	if err != nil {
 		return errors.Trace(err)
 	}
-	if cfg.Until, err = ParseTSString(tsString); err != nil {
+	if cfg.Until, err = ParseTSString(tsString, true); err != nil {
 		return errors.Trace(err)
 	}
 	if cfg.SkipPrompt, err = flags.GetBool(flagYes); err != nil {
@@ -213,7 +213,7 @@ func (cfg *StreamConfig) ParseStreamStartFromFlags(flags *pflag.FlagSet) error {
 		return errors.Trace(err)
 	}
 
-	if cfg.StartTS, err = ParseTSString(tsString); err != nil {
+	if cfg.StartTS, err = ParseTSString(tsString, true); err != nil {
 		return errors.Trace(err)
 	}
 
@@ -222,7 +222,7 @@ func (cfg *StreamConfig) ParseStreamStartFromFlags(flags *pflag.FlagSet) error {
 		return errors.Trace(err)
 	}
 
-	if cfg.EndTS, err = ParseTSString(tsString); err != nil {
+	if cfg.EndTS, err = ParseTSString(tsString, true); err != nil {
 		return errors.Trace(err)
 	}