diff --git a/pkg/strategy/pivotshort/breaklow.go b/pkg/strategy/pivotshort/breaklow.go
index 4e916cb51..d446a82ff 100644
--- a/pkg/strategy/pivotshort/breaklow.go
+++ b/pkg/strategy/pivotshort/breaklow.go
@@ -70,7 +70,7 @@ func (s *BreakLow) Bind(session *bbgo.ExchangeSession, orderExecutor *bbgo.Gener
 		}
 
 		if lastLow.Compare(s.lastLow) != 0 {
-			bbgo.Notify("%s new pivot low detected: %f %s", s.Symbol, s.pivot.LastLow(), kline.EndTime.Time())
+			bbgo.Notify("%s new pivot low detected: %f %s", s.Symbol, s.pivot.LastLow(), kline.EndTime.Time().String())
 		}
 
 		s.lastLow = lastLow
diff --git a/pkg/util/simple_args.go b/pkg/util/simple_args.go
index 47c0234b2..bef39d9e0 100644
--- a/pkg/util/simple_args.go
+++ b/pkg/util/simple_args.go
@@ -2,6 +2,7 @@ package util
 
 import (
 	"reflect"
+	"time"
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
 )
@@ -11,7 +12,7 @@ import (
 func FilterSimpleArgs(args []interface{}) (simpleArgs []interface{}) {
 	for _, arg := range args {
 		switch arg.(type) {
-		case int, int64, int32, uint64, uint32, string, []byte, float64, float32, fixedpoint.Value:
+		case int, int64, int32, uint64, uint32, string, []byte, float64, float32, fixedpoint.Value, time.Time:
 			simpleArgs = append(simpleArgs, arg)
 		default:
 			rt := reflect.TypeOf(arg)