diff --git a/exchanges/okx/okx_type_convert.go b/exchanges/okx/okx_type_convert.go
index 523d8c1fd23..18d2b4533fe 100644
--- a/exchanges/okx/okx_type_convert.go
+++ b/exchanges/okx/okx_type_convert.go
@@ -212,35 +212,21 @@ func (a *OrderDetail) UnmarshalJSON(data []byte) error {
 }
 
 // UnmarshalJSON deserializes JSON, and timestamp information.
-func (a *PendingOrderItem) UnmarshalJSON(data []byte) error {
+func (o *PendingOrderItem) UnmarshalJSON(data []byte) error {
 	type Alias PendingOrderItem
-	chil := &struct {
+	a := &struct {
 		*Alias
-		Side         string `json:"side"`
-		UpdateTime   string `json:"uTime"`
-		CreationTime string `json:"cTime"`
+		UpdateTime   okxUnixMilliTime `json:"uTime"`
+		CreationTime okxUnixMilliTime `json:"cTime"`
+		FillTime     okxUnixMilliTime `json:"fillTime"`
 	}{
-		Alias: (*Alias)(a),
-	}
-	err := json.Unmarshal(data, chil)
-	if err != nil {
-		return err
-	}
-	uTime, err := strconv.ParseInt(chil.UpdateTime, 10, 64)
-	if err != nil {
-		return err
+		Alias: (*Alias)(o),
 	}
-	cTime, err := strconv.ParseInt(chil.CreationTime, 10, 64)
-	if err != nil {
-		return err
-	}
-	a.Side, err = order.StringToOrderSide(chil.Side)
-	if err != nil {
-		return err
-	}
-	a.CreationTime = time.UnixMilli(cTime)
-	a.UpdateTime = time.UnixMilli(uTime)
-	return nil
+	err := json.Unmarshal(data, a)
+	o.CreationTime = a.CreationTime.Time()
+	o.UpdateTime = a.UpdateTime.Time()
+	o.FillTime = a.FillTime.Time()
+	return err
 }
 
 // UnmarshalJSON deserializes JSON, and timestamp information.
diff --git a/exchanges/okx/okx_types.go b/exchanges/okx/okx_types.go
index 606ecb63a1c..25c24bce0a9 100644
--- a/exchanges/okx/okx_types.go
+++ b/exchanges/okx/okx_types.go
@@ -727,7 +727,7 @@ type PendingOrderItem struct {
 	FeeCurrency                string                  `json:"feeCcy"`
 	LastFilledPrice            convert.StringToFloat64 `json:"fillPx"`
 	LastFilledSize             convert.StringToFloat64 `json:"fillSz"`
-	FillTime                   string                  `json:"fillTime"`
+	FillTime                   time.Time               `json:"fillTime"`
 	InstrumentID               string                  `json:"instId"`
 	InstrumentType             string                  `json:"instType"`
 	Leverage                   convert.StringToFloat64 `json:"lever"`