diff --git a/expression/builtin_time.go b/expression/builtin_time.go
index 8b74c95e53972..4ee4f9036a106 100644
--- a/expression/builtin_time.go
+++ b/expression/builtin_time.go
@@ -1889,8 +1889,8 @@ func (b *builtinSysDateWithFspSig) evalTime(row types.Row) (d types.Time, isNull
 		return types.Time{}, isNull, errors.Trace(err)
 	}
 
-	tz := b.ctx.GetSessionVars().Location()
-	now := time.Now().In(tz)
+	loc := b.ctx.GetSessionVars().Location()
+	now := time.Now().In(loc)
 	result, err := convertTimeToMysqlTime(now, int(fsp))
 	if err != nil {
 		return types.Time{}, true, errors.Trace(err)
@@ -3663,7 +3663,7 @@ func getBf4TimeAddSub(ctx sessionctx.Context, args []Expression) (tp1, tp2 *type
 }
 
 func getTimeZone(ctx sessionctx.Context) *time.Location {
-	ret := ctx.GetSessionVars().TimeZone
+	ret := ctx.GetSessionVars().Loc
 	if ret == nil {
 		ret = time.Local
 	}
diff --git a/expression/builtin_time_test.go b/expression/builtin_time_test.go
index 381a69aff0721..f82e1aa3f330d 100644
--- a/expression/builtin_time_test.go
+++ b/expression/builtin_time_test.go
@@ -1447,7 +1447,7 @@ func (s *testEvaluatorSuite) TestUnixTimestamp(c *C) {
 	c.Assert(d.IsNull(), Equals, true)
 
 	// Set the time_zone variable, because UnixTimestamp() result depends on it.
-	s.ctx.GetSessionVars().TimeZone = time.UTC
+	s.ctx.GetSessionVars().Loc = time.UTC
 	tests := []struct {
 		inputDecimal int
 		input        types.Datum
@@ -2213,9 +2213,9 @@ func (s *testEvaluatorSuite) TestLastDay(c *C) {
 func (s *testEvaluatorSuite) TestWithTimeZone(c *C) {
 	sv := s.ctx.GetSessionVars()
 	originTZ := sv.Location()
-	sv.TimeZone, _ = time.LoadLocation("Asia/Tokyo")
+	sv.Loc, _ = time.LoadLocation("Asia/Tokyo")
 	defer func() {
-		sv.TimeZone = originTZ
+		sv.Loc = originTZ
 	}()
 
 	timeToGoTime := func(d types.Datum, loc *time.Location) time.Time {
@@ -2224,7 +2224,7 @@ func (s *testEvaluatorSuite) TestWithTimeZone(c *C) {
 	}
 	durationToGoTime := func(d types.Datum, loc *time.Location) time.Time {
 		t, _ := d.GetMysqlDuration().ConvertToTime(sv.StmtCtx, mysql.TypeDatetime)
-		result, _ := t.Time.GoTime(sv.TimeZone)
+		result, _ := t.Time.GoTime(sv.Loc)
 		return result
 	}
 
@@ -2242,11 +2242,11 @@ func (s *testEvaluatorSuite) TestWithTimeZone(c *C) {
 	}
 
 	for _, t := range tests {
-		now := time.Now().In(sv.TimeZone)
+		now := time.Now().In(sv.Loc)
 		f, err := funcs[t.method].getFunction(s.ctx, s.datumsToConstants(t.Input))
 		d, err := evalBuiltinFunc(f, nil)
 		c.Assert(err, IsNil)
-		result := t.convertToTime(d, sv.TimeZone)
+		result := t.convertToTime(d, sv.Loc)
 		c.Assert(result.Sub(now), LessEqual, 2*time.Second)
 	}
 }
diff --git a/plan/cache.go b/plan/cache.go
index c85fc363c0f05..aa1002d01b7f7 100644
--- a/plan/cache.go
+++ b/plan/cache.go
@@ -80,8 +80,8 @@ func (key *sqlCacheKey) Hash() []byte {
 // NewSQLCacheKey creates a new sqlCacheKey object.
 func NewSQLCacheKey(sessionVars *variable.SessionVars, sql string, schemaVersion int64, readOnly bool) kvcache.Key {
 	timezoneOffset, user, host := 0, "", ""
-	if sessionVars.TimeZone != nil {
-		_, timezoneOffset = time.Now().In(sessionVars.TimeZone).Zone()
+	if sessionVars.Loc != nil {
+		_, timezoneOffset = time.Now().In(sessionVars.Loc).Zone()
 	}
 	if sessionVars.User != nil {
 		user = sessionVars.User.Username
@@ -135,8 +135,8 @@ func (key *pstmtPlanCacheKey) Hash() []byte {
 // NewPSTMTPlanCacheKey creates a new pstmtPlanCacheKey object.
 func NewPSTMTPlanCacheKey(sessionVars *variable.SessionVars, pstmtID uint32, schemaVersion int64) kvcache.Key {
 	timezoneOffset := 0
-	if sessionVars.TimeZone != nil {
-		_, timezoneOffset = time.Now().In(sessionVars.TimeZone).Zone()
+	if sessionVars.Loc != nil {
+		_, timezoneOffset = time.Now().In(sessionVars.Loc).Zone()
 	}
 	return &pstmtPlanCacheKey{
 		database:       sessionVars.CurrentDB,
diff --git a/plan/cache_test.go b/plan/cache_test.go
index b02f1bb13f6a9..5f3326f48b14f 100644
--- a/plan/cache_test.go
+++ b/plan/cache_test.go
@@ -31,7 +31,7 @@ func (s *testCacheSuite) SetUpSuite(c *C) {
 	ctx := mockContext()
 	ctx.GetSessionVars().SnapshotTS = 0
 	ctx.GetSessionVars().SQLMode = mysql.ModeNone
-	ctx.GetSessionVars().TimeZone = time.UTC
+	ctx.GetSessionVars().Loc = time.UTC
 	ctx.GetSessionVars().ConnectionID = 0
 	s.ctx = ctx
 }
diff --git a/sessionctx/variable/session.go b/sessionctx/variable/session.go
index d2c0e43518735..f0b9e7136f512 100644
--- a/sessionctx/variable/session.go
+++ b/sessionctx/variable/session.go
@@ -255,7 +255,7 @@ type SessionVars struct {
 
 	// Per-connection time zones. Each client that connects has its own time zone setting, given by the session time_zone variable.
 	// See https://dev.mysql.com/doc/refman/5.7/en/time-zone-support.html
-	TimeZone *time.Location
+	Loc *time.Location
 
 	SQLMode mysql.SQLMode
 
@@ -413,7 +413,7 @@ func (s *SessionVars) GetNextPreparedStmtID() uint32 {
 
 // Location returns the value of time_zone session variable. If it is nil, then return time.Local.
 func (s *SessionVars) Location() *time.Location {
-	loc := s.TimeZone
+	loc := s.Loc
 	if loc == nil {
 		loc = time.Local
 	}
@@ -458,7 +458,7 @@ func (s *SessionVars) SetSystemVar(name string, val string) error {
 		if err != nil {
 			return errors.Trace(err)
 		}
-		s.TimeZone = tz
+		s.Loc = tz
 	case SQLModeVar:
 		val = mysql.FormatSQLModeStr(val)
 		// Modes is a list of different modes separated by commas.
diff --git a/sessionctx/variable/varsutil_test.go b/sessionctx/variable/varsutil_test.go
index 4ec98a2f26bb8..ff22858646495 100644
--- a/sessionctx/variable/varsutil_test.go
+++ b/sessionctx/variable/varsutil_test.go
@@ -154,11 +154,11 @@ func (s *testVarsutilSuite) TestVarsutil(c *C) {
 	for _, tt := range tests {
 		err = SetSessionSystemVar(v, TimeZone, types.NewStringDatum(tt.input))
 		c.Assert(err, IsNil)
-		c.Assert(v.TimeZone.String(), Equals, tt.expect)
+		c.Assert(v.Loc.String(), Equals, tt.expect)
 		if tt.compareValue {
 			SetSessionSystemVar(v, TimeZone, types.NewStringDatum(tt.input))
 			t1 := time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC)
-			t2 := time.Date(2000, 1, 1, 0, 0, 0, 0, v.TimeZone)
+			t2 := time.Date(2000, 1, 1, 0, 0, 0, 0, v.Loc)
 			c.Assert(t2.Sub(t1), Equals, tt.diff)
 		}
 	}
diff --git a/store/tikv/gcworker/gc_worker.go b/store/tikv/gcworker/gc_worker.go
index 082a8729de5ab..d29c4b91b6022 100644
--- a/store/tikv/gcworker/gc_worker.go
+++ b/store/tikv/gcworker/gc_worker.go
@@ -760,7 +760,6 @@ func (w *GCWorker) checkLeader() (bool, error) {
 			terror.Log(errors.Trace(err1))
 			return false, errors.Trace(err)
 		}
-		fmt.Println("fuck" + time.Now().String())
 		err = w.saveTime(gcLeaderLeaseKey, time.Now().Add(gcWorkerLease))
 		if err != nil {
 			_, err1 := se.Execute(ctx, "ROLLBACK")