diff --git a/domain/schema_validator.go b/domain/schema_validator.go
index 2b4e5bc662748..cc91939250c65 100644
--- a/domain/schema_validator.go
+++ b/domain/schema_validator.go
@@ -17,6 +17,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/pingcap/tidb/store/tikv/oracle"
 	log "github.com/sirupsen/logrus"
 )
 
@@ -107,7 +108,7 @@ func (s *schemaValidator) Update(leaseGrantTS uint64, oldVer, currVer int64, cha
 
 	// Renew the lease.
 	s.latestSchemaVer = currVer
-	leaseGrantTime := extractPhysicalTime(leaseGrantTS)
+	leaseGrantTime := oracle.GetTimeFromTS(leaseGrantTS)
 	leaseExpire := leaseGrantTime.Add(s.lease - time.Millisecond)
 	s.latestSchemaExpire = leaseExpire
 
@@ -187,18 +188,13 @@ func (s *schemaValidator) Check(txnTS uint64, schemaVer int64, relatedTableIDs [
 	}
 
 	// Schema unchanged, maybe success or the schema validator is unavailable.
-	t := extractPhysicalTime(txnTS)
+	t := oracle.GetTimeFromTS(txnTS)
 	if t.After(s.latestSchemaExpire) {
 		return ResultUnknown
 	}
 	return ResultSucc
 }
 
-func extractPhysicalTime(ts uint64) time.Time {
-	t := int64(ts >> 18) // 18 is for the logical time.
-	return time.Unix(t/1e3, (t%1e3)*1e6)
-}
-
 func (s *schemaValidator) enqueue(schemaVersion int64, relatedTableIDs []int64) {
 	s.deltaSchemaInfos = append(s.deltaSchemaInfos, deltaSchemaInfo{schemaVersion, relatedTableIDs})
 	if len(s.deltaSchemaInfos) > maxNumberOfDiffsToLoad {
diff --git a/store/tikv/oracle/oracle.go b/store/tikv/oracle/oracle.go
index 6dc1779d3b2f6..39f2223ca4bae 100644
--- a/store/tikv/oracle/oracle.go
+++ b/store/tikv/oracle/oracle.go
@@ -57,5 +57,5 @@ func EncodeTSO(ts int64) uint64 {
 // GetTimeFromTS extracts time.Time from a timestamp.
 func GetTimeFromTS(ts uint64) time.Time {
 	ms := ExtractPhysical(ts)
-	return time.Unix(ms/1000, (ms%1000)*1e6)
+	return time.Unix(ms/1e3, (ms%1e3)*1e6)
 }