diff --git a/README.en.md b/README.en.md
index f54992e..0fbcbe1 100755
--- a/README.en.md
+++ b/README.en.md
@@ -157,17 +157,17 @@ carbon.Parse("2020-08-05 13:14:15").SetSecond(60).ToDateTimeString() // 2020-08-
 // Start of the year
 carbon.Parse("2020-08-05 13:14:15").StartOfYear().ToDateTimeString() // 2020-01-01 00:00:00
 // End of the year
-carbon.Parse("2020-08-05 13:14:15").EndOfYear().ToEndTimeString() // 2020-12-31 23:59:59
+carbon.Parse("2020-08-05 13:14:15").EndOfYear().ToDateTimeString() // 2020-12-31 23:59:59
 
 // Start of the month
 carbon.Parse("2020-08-05 13:14:15").StartOfMonth().ToStartTimeString() // 2020-08-01 00:00:00
 // End of the month
-carbon.Parse("2020-08-05 13:14:15").EndOfMonth().ToEndTimeString() // 2020-08-31 23:59:59
+carbon.Parse("2020-08-05 13:14:15").EndOfMonth().ToDateTimeString() // 2020-08-31 23:59:59
 
 // Start of the week
-carbon.Parse("2020-08-05 13:14:15").StartOfWeek().ToStartTimeString() // 2020-08-03 00:00:00
+carbon.Parse("2020-08-05 13:14:15").StartOfWeek().ToDateTimeString() // 2020-08-03 00:00:00
 // End of the week
-carbon.Parse("2020-08-05 13:14:15").LastOfWeek().ToEndTimeString() // 2020-08-09 23:59:59
+carbon.Parse("2020-08-05 13:14:15").LastOfWeek().ToDateTimeString() // 2020-08-09 23:59:59
 
 // Start of the day
 carbon.Parse("2020-08-05 13:14:15").StartOfDay().ToDateTimeString() // 2020-08-05 00:00:00
@@ -584,8 +584,8 @@ user := UserModel {
 user.ID // 18
 user.Name // 勾国印
 user.Birthday.ToDateString() // 2012-08-05
-user.CreatedAt.ToTimestamp() // 2012-08-05 13:14:15
-user.DeletedAt.ToDateTimeString() // 1596604455
+user.CreatedAt.ToTimestamp() // 1596604455 
+user.DeletedAt.ToDateTimeString() // 2012-08-05 13:14:15
 user.GraduatedAt.AddDay().ToDateString() // 2012-09-10
 user.UpdatedAt.ToDateString() // 2012-08-05
 ```
diff --git a/database.go b/database.go
index 6036522..9e0c0cd 100644
--- a/database.go
+++ b/database.go
@@ -22,6 +22,22 @@ type ToTimestamp struct {
 	Carbon
 }
 
+type ToTimestampWithSecond struct {
+	Carbon
+}
+
+type ToTimestampWithMillisecond struct {
+	Carbon
+}
+
+type ToTimestampWithMicrosecond struct {
+	Carbon
+}
+
+type ToTimestampWithNanosecond struct {
+	Carbon
+}
+
 func (c *Carbon) Scan(v interface{}) error {
 	value, ok := v.(time.Time)
 	if ok {
@@ -59,3 +75,19 @@ func (c ToTimeString) MarshalJSON() ([]byte, error) {
 func (c ToTimestamp) MarshalJSON() ([]byte, error) {
 	return []byte(fmt.Sprintf(`%d`, c.ToTimestamp())), nil
 }
+
+func (c ToTimestampWithSecond) MarshalJSON() ([]byte, error) {
+	return []byte(fmt.Sprintf(`%d`, c.ToTimestampWithSecond())), nil
+}
+
+func (c ToTimestampWithMillisecond) MarshalJSON() ([]byte, error) {
+	return []byte(fmt.Sprintf(`%d`, c.ToTimestampWithMillisecond())), nil
+}
+
+func (c ToTimestampWithMicrosecond) MarshalJSON() ([]byte, error) {
+	return []byte(fmt.Sprintf(`%d`, c.ToTimestampWithMicrosecond())), nil
+}
+
+func (c ToTimestampWithNanosecond) MarshalJSON() ([]byte, error) {
+	return []byte(fmt.Sprintf(`%d`, c.ToTimestampWithNanosecond())), nil
+}