diff --git a/.example/other/test.go b/.example/other/test.go
index 143fc563f..1207f662d 100644
--- a/.example/other/test.go
+++ b/.example/other/test.go
@@ -2,18 +2,25 @@ package main
 
 import (
 	"fmt"
-	"github.com/gogf/gf/frame/g"
 	"github.com/gogf/gf/os/gtime"
 	"github.com/gogf/gf/util/gconv"
 )
 
 func main() {
-	type T struct {
-		UpdateTime gtime.Time
-	}
-	t := new(T)
-	gconv.Struct(g.Map{
-		"UpdateTime": gtime.Now(),
-	}, t)
-	fmt.Println(t.UpdateTime)
+	// select * from table1 where field1='1111'
+	// and (
+	//   (field2='2' and field3='3')
+	//   or
+	//   (field2='21' and field3='31')
+	//   or
+	//   (field2='22' and field3='32')
+	// )
+	//g.DB().Table("table1").
+	//	Where("field1", "1111").
+	//	And(g.Map{"field2": 2, "field3": 3})
+	//fmt.Println(gconv.GTime("2020-01-01 12:01:00").String())
+	//t := gconv.Convert("2020-01-01 12:01:00", "gtime.Time").(gtime.Time)
+	t := gconv.Convert(1989, "gtime.Time").(gtime.Time)
+	fmt.Println(t.String())
+	fmt.Println(gconv.String(t))
 }
diff --git a/net/ghttp/ghttp_request_middleware.go b/net/ghttp/ghttp_request_middleware.go
index 6bb704ce7..f4e4907e9 100644
--- a/net/ghttp/ghttp_request_middleware.go
+++ b/net/ghttp/ghttp_request_middleware.go
@@ -38,11 +38,12 @@ func (m *Middleware) Next() {
 			m.handlerIndex++
 			continue
 		}
-		// Router values switching.
-		m.request.routerMap = item.values
 		// Current router switching.
 		m.request.Router = item.handler.router
 
+		// Router values switching.
+		m.request.routerMap = item.values
+
 		gutil.TryCatch(func() {
 			// Execute bound middleware array of the item if it's not empty.
 			if m.handlerMDIndex < len(item.handler.middleware) {
diff --git a/util/gconv/gconv.go b/util/gconv/gconv.go
index f694aeb76..54a99ddc3 100644
--- a/util/gconv/gconv.go
+++ b/util/gconv/gconv.go
@@ -201,11 +201,21 @@ func String(i interface{}) string {
 		return value
 	case []byte:
 		return string(value)
+	case time.Time:
+		if value.IsZero() {
+			return ""
+		}
+		return value.String()
 	case *time.Time:
 		if value == nil {
 			return ""
 		}
 		return value.String()
+	case gtime.Time:
+		if value.IsZero() {
+			return ""
+		}
+		return value.String()
 	case *gtime.Time:
 		if value == nil {
 			return ""
diff --git a/util/gconv/gconv_z_all_test.go b/util/gconv/gconv_z_all_test.go
index f94a32453..8a1f577bc 100644
--- a/util/gconv/gconv_z_all_test.go
+++ b/util/gconv/gconv_z_all_test.go
@@ -637,7 +637,7 @@ func Test_Convert_All(t *testing.T) {
 		gtest.AssertEQ(gconv.Convert("1989-01-02", "Time", "Y-m-d"), gconv.Time("1989-01-02", "Y-m-d"))
 		gtest.AssertEQ(gconv.Convert(1989, "Time"), gconv.Time("1970-01-01 08:33:09 +0800 CST"))
 		gtest.AssertEQ(gconv.Convert(gtime.Now(), "gtime.Time", 1), nil)
-		gtest.AssertEQ(gconv.Convert(1989, "gtime.Time"), gtime.Time{gconv.Time("1970-01-01 08:33:09 +0800 CST")})
+		gtest.AssertEQ(gconv.Convert(1989, "gtime.Time"), *gconv.GTime("1970-01-01 08:33:09 +0800 CST"))
 		gtest.AssertEQ(gconv.Convert(gtime.Now(), "*gtime.Time", 1), nil)
 		gtest.AssertEQ(gconv.Convert(gtime.Now(), "GTime", 1), nil)
 		gtest.AssertEQ(gconv.Convert(1989, "*gtime.Time"), gconv.GTime(1989))