diff --git a/expression/builtin_time.go b/expression/builtin_time.go
index fd9d7f59bb4ae..6bab66a00bd0e 100644
--- a/expression/builtin_time.go
+++ b/expression/builtin_time.go
@@ -235,10 +235,10 @@ var (
 	_ builtinFunc = &builtinSubDateDatetimeDecimalSig{}
 )
 
-func convertTimeToMysqlTime(t time.Time, fsp int, useTrunc bool) (types.Time, error) {
+func convertTimeToMysqlTime(t time.Time, fsp int, roundMode types.RoundMode) (types.Time, error) {
 	var tr time.Time
 	var err error
-	if useTrunc {
+	if roundMode == types.ModeTruncate {
 		tr, err = types.TruncateFrac(t, fsp)
 	} else {
 		tr, err = types.RoundFrac(t, fsp)
@@ -1611,7 +1611,7 @@ func evalFromUnixTime(ctx sessionctx.Context, fsp int, row chunk.Row, arg Expres
 
 	sc := ctx.GetSessionVars().StmtCtx
 	tmp := time.Unix(integralPart, fractionalPart).In(sc.TimeZone)
-	t, err := convertTimeToMysqlTime(tmp, fsp, false)
+	t, err := convertTimeToMysqlTime(tmp, fsp, types.ModeHalfEven)
 	if err != nil {
 		return res, true, err
 	}
@@ -1933,7 +1933,7 @@ func (b *builtinSysDateWithFspSig) evalTime(row chunk.Row) (d types.Time, isNull
 
 	loc := b.ctx.GetSessionVars().Location()
 	now := time.Now().In(loc)
-	result, err := convertTimeToMysqlTime(now, int(fsp), false)
+	result, err := convertTimeToMysqlTime(now, int(fsp), types.ModeHalfEven)
 	if err != nil {
 		return types.Time{}, true, err
 	}
@@ -1955,7 +1955,7 @@ func (b *builtinSysDateWithoutFspSig) Clone() builtinFunc {
 func (b *builtinSysDateWithoutFspSig) evalTime(row chunk.Row) (d types.Time, isNull bool, err error) {
 	tz := b.ctx.GetSessionVars().Location()
 	now := time.Now().In(tz)
-	result, err := convertTimeToMysqlTime(now, 0, false)
+	result, err := convertTimeToMysqlTime(now, 0, types.ModeHalfEven)
 	if err != nil {
 		return types.Time{}, true, err
 	}
@@ -2284,7 +2284,7 @@ func evalUTCTimestampWithFsp(ctx sessionctx.Context, fsp int) (types.Time, bool,
 	if nowTs.Equal(time.Time{}) {
 		*nowTs = time.Now()
 	}
-	result, err := convertTimeToMysqlTime(nowTs.UTC(), fsp, false)
+	result, err := convertTimeToMysqlTime(nowTs.UTC(), fsp, types.ModeHalfEven)
 	if err != nil {
 		return types.Time{}, true, err
 	}
@@ -2384,7 +2384,7 @@ func evalNowWithFsp(ctx sessionctx.Context, fsp int) (types.Time, bool, error) {
 	//	+----------------------------+-------------------------+---------------------+
 	//	| 2019-03-25 15:57:56.612966 | 2019-03-25 15:57:56.612 | 2019-03-25 15:57:56 |
 	//	+----------------------------+-------------------------+---------------------+
-	result, err := convertTimeToMysqlTime(*sysTs, fsp, true)
+	result, err := convertTimeToMysqlTime(*sysTs, fsp, types.ModeTruncate)
 	if err != nil {
 		return types.Time{}, true, err
 	}