diff --git a/base_logger.go b/base_logger.go
index 8b685b6..d650209 100644
--- a/base_logger.go
+++ b/base_logger.go
@@ -67,7 +67,7 @@ func (l *baseLogger) init(w Writer, lvl level.Level, appendTime bool) {
 	l.lvl = lvl
 	l.f = formatter.Default()
 	l.appendTime = appendTime
-	l.setTimeFormat(content.DefaultLogTimeFormat)
+	l.setTimeFormat(content.DefaultLogTimeFormat())
 }
 
 func (l *baseLogger) setFormatter(f formatter.Formatter) {
@@ -78,7 +78,7 @@ func (l *baseLogger) setFormatter(f formatter.Formatter) {
 
 func (l *baseLogger) setTimeFormat(f string) {
 	if len(f) == 0 {
-		f = content.DefaultLogTimeFormat
+		f = content.DefaultLogTimeFormat()
 	}
 	l.timeFormat = f
 }
diff --git a/console_logger_test.go b/console_logger_test.go
index 9df90e8..3b9a642 100644
--- a/console_logger_test.go
+++ b/console_logger_test.go
@@ -15,8 +15,8 @@ func TestConsoleLogger(t *testing.T) {
 		timeFormat  string
 	}{
 		{"TextFormatter", formatter.TextFormatter, false, testTimeFormat},
-		{"JsonFormatter", formatter.JsonFormatter, false, ""},
-		{"TextFormatter Concurrency", formatter.TextFormatter, true, testTimeFormat},
+		{"JsonFormatter", formatter.JsonFormatter, false, testTimeFormat},
+		{"TextFormatter Concurrency", formatter.TextFormatter, true, ""},
 		{"JsonFormatter Concurrency", formatter.JsonFormatter, true, ""},
 	}
 	for _, tc := range testCases {
diff --git a/content/time.go b/content/time.go
index 0738da0..bdb0cda 100644
--- a/content/time.go
+++ b/content/time.go
@@ -2,9 +2,8 @@ package content
 
 import "time"
 
-const (
-	// DefaultLogTimeFormat the default log time format
-	DefaultLogTimeFormat = "2006-01-02 15:04:05"
+var (
+	defaultLogTimeFormat = "2006-01-02 15:04:05"
 )
 
 // Time the custom Time for log
@@ -13,9 +12,21 @@ type Time struct {
 	format string
 }
 
+// InitDefaultLogTimeFormat init the global default log time format
+func InitDefaultLogTimeFormat(f string) {
+	if len(f) > 0 {
+		defaultLogTimeFormat = f
+	}
+}
+
+// DefaultLogTimeFormat return the default log time format
+func DefaultLogTimeFormat() string {
+	return defaultLogTimeFormat
+}
+
 // NewTime convert time.Time to content.Time pointer with default format
 func NewTime(time time.Time) *Time {
-	return NewTimeWithFormat(time, DefaultLogTimeFormat)
+	return NewTimeWithFormat(time, DefaultLogTimeFormat())
 }
 
 // NewTimeWithFormat convert time.Time to content.Time pointer with custom format
diff --git a/content/time_test.go b/content/time_test.go
index 2af9633..288d7ac 100644
--- a/content/time_test.go
+++ b/content/time_test.go
@@ -6,16 +6,33 @@ import (
 )
 
 func TestTime_MarshalText(t *testing.T) {
-	now := time.Now()
-	expect := now.Format(DefaultLogTimeFormat)
-	ti := NewTime(time.Now())
-	data, err := ti.MarshalText()
-	if err != nil {
-		t.Errorf("Time.MarshalText error => %v", err)
-		return
+	testCases := []struct {
+		name   string
+		format string
+	}{
+		{"default", ""},
+		{"RFC3339", time.RFC3339},
+		{"RFC3339Nano", time.RFC3339Nano},
 	}
-	actual := string(data)
-	if expect != actual {
-		t.Errorf("test Time.MarshalText failed, expect to get %s, but actual get %s", expect, actual)
+	for _, tc := range testCases {
+		now := time.Now()
+		if len(tc.format) > 0 {
+			InitDefaultLogTimeFormat(tc.format)
+		} else {
+			tc.format = DefaultLogTimeFormat()
+		}
+
+		expect := now.Format(tc.format)
+		ti := NewTime(now)
+		data, err := ti.MarshalText()
+		if err != nil {
+			t.Errorf("Time.MarshalText error => %v", err)
+			return
+		}
+		actual := string(data)
+		if expect != actual {
+			t.Errorf("test Time.MarshalText failed, expect to get %s, but actual get %s", expect, actual)
+		}
 	}
+
 }
diff --git a/file_logger_test.go b/file_logger_test.go
index 891c058..00c7684 100644
--- a/file_logger_test.go
+++ b/file_logger_test.go
@@ -18,8 +18,8 @@ func TestFileLogger(t *testing.T) {
 		timeFormat  string
 	}{
 		{"TextFormatter", formatter.TextFormatter, false, testTimeFormat},
-		{"JsonFormatter", formatter.JsonFormatter, false, ""},
-		{"TextFormatter Concurrency", formatter.TextFormatter, true, testTimeFormat},
+		{"JsonFormatter", formatter.JsonFormatter, false, testTimeFormat},
+		{"TextFormatter Concurrency", formatter.TextFormatter, true, ""},
 		{"JsonFormatter Concurrency", formatter.JsonFormatter, true, ""},
 	}
 	for _, tc := range testCases {
diff --git a/formatter/json/json_test.go b/formatter/json/json_test.go
index a20aa2d..5e46828 100644
--- a/formatter/json/json_test.go
+++ b/formatter/json/json_test.go
@@ -10,7 +10,7 @@ import (
 )
 
 func TestJsonFormatter_Serialize(t *testing.T) {
-	logTime, _ := time.ParseInLocation(content.DefaultLogTimeFormat, "2022-06-25 23:59:59", time.UTC)
+	logTime, _ := time.ParseInLocation("2006-01-02 15:04:05", "2022-06-25 23:59:59", time.UTC)
 	logTimeP := content.NewTime(logTime)
 
 	testCases := []struct {
diff --git a/formatter/text/text_test.go b/formatter/text/text_test.go
index f3c7ccb..624cf24 100644
--- a/formatter/text/text_test.go
+++ b/formatter/text/text_test.go
@@ -10,7 +10,7 @@ import (
 )
 
 func TestTextFormatter_Serialize(t *testing.T) {
-	logTime, _ := time.ParseInLocation(content.DefaultLogTimeFormat, "2022-06-25 23:59:59", time.UTC)
+	logTime, _ := time.ParseInLocation("2006-01-02 15:04:05", "2022-06-25 23:59:59", time.UTC)
 	logTimeP := content.NewTime(logTime)
 
 	testCases := []struct {
diff --git a/logger_test.go b/logger_test.go
index a23f10d..4fbf6e2 100644
--- a/logger_test.go
+++ b/logger_test.go
@@ -5,7 +5,6 @@ import (
 	"testing"
 	"time"
 
-	"github.com/no-src/log/content"
 	"github.com/no-src/log/formatter"
 	"github.com/no-src/log/internal/sync"
 	"github.com/no-src/log/level"
@@ -14,7 +13,7 @@ import (
 var (
 	concurrencyCount   = 3
 	concurrencyTimeout = time.Second * 5
-	testTimeFormat     = content.DefaultLogTimeFormat
+	testTimeFormat     = time.RFC3339
 )
 
 func testLogs(t *testing.T) {
diff --git a/multi_logger_test.go b/multi_logger_test.go
index 93c15dd..0e0d1ac 100644
--- a/multi_logger_test.go
+++ b/multi_logger_test.go
@@ -3,7 +3,6 @@ package log
 import (
 	"errors"
 	"testing"
-	"time"
 
 	"github.com/no-src/log/formatter"
 	"github.com/no-src/log/level"
@@ -49,9 +48,7 @@ func TestMultiLogger_WithTimeFormat(t *testing.T) {
 		format string
 	}{
 		{"empty", ""},
-		{"default", testTimeFormat},
-		{"RFC3339", time.RFC3339},
-		{"RFC3339Nano", time.RFC3339Nano},
+		{"customized", testTimeFormat},
 	}
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {