diff --git a/os/gtime/gtime_time.go b/os/gtime/gtime_time.go
index cfe82bb43..3187a2d29 100644
--- a/os/gtime/gtime_time.go
+++ b/os/gtime/gtime_time.go
@@ -8,7 +8,6 @@ package gtime
 
 import (
 	"bytes"
-	"github.com/gogf/gf/util/gconv"
 	"time"
 )
 
@@ -196,12 +195,12 @@ func (t *Time) Truncate(d time.Duration) *Time {
 
 // MarshalJSON implements the interface MarshalJSON for json.Marshal.
 func (t *Time) MarshalJSON() ([]byte, error) {
-	return gconv.UnsafeStrToBytes(`"` + t.String() + `"`), nil
+	return []byte(`"` + t.String() + `"`), nil
 }
 
 // UnmarshalJSON implements the interface UnmarshalJSON for json.Unmarshal.
 func (t *Time) UnmarshalJSON(b []byte) error {
-	newTime, err := StrToTime(gconv.UnsafeBytesToStr(bytes.Trim(b, `"`)))
+	newTime, err := StrToTime(string(bytes.Trim(b, `"`)))
 	if err != nil {
 		return err
 	}
diff --git a/os/gtime/gtime_z_unit_basic_test.go b/os/gtime/gtime_z_unit_basic_test.go
index 7e458fd0b..7f2023e1f 100644
--- a/os/gtime/gtime_z_unit_basic_test.go
+++ b/os/gtime/gtime_z_unit_basic_test.go
@@ -1,3 +1,9 @@
+// Copyright 2019 gf Author(https://github.com/gogf/gf). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
 package gtime_test
 
 import (
diff --git a/os/gtime/gtime_z_unit_format_test.go b/os/gtime/gtime_z_unit_format_test.go
index 95551ced9..fa79a5e7f 100644
--- a/os/gtime/gtime_z_unit_format_test.go
+++ b/os/gtime/gtime_z_unit_format_test.go
@@ -1,3 +1,9 @@
+// Copyright 2019 gf Author(https://github.com/gogf/gf). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
 package gtime_test
 
 import (
diff --git a/os/gtime/gtime_z_unit_time_test.go b/os/gtime/gtime_z_unit_time_test.go
index 51be0b2b6..071844c46 100644
--- a/os/gtime/gtime_z_unit_time_test.go
+++ b/os/gtime/gtime_z_unit_time_test.go
@@ -1,3 +1,9 @@
+// Copyright 2019 gf Author(https://github.com/gogf/gf). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
 package gtime_test
 
 import (