diff --git a/database/model/base.go b/database/model/base.go
index 75e27ff..88f9473 100644
--- a/database/model/base.go
+++ b/database/model/base.go
@@ -1,33 +1,49 @@
 package model
 
 import (
+	"database/sql/driver"
+	"fmt"
 	"time"
-
-	"gorm.io/gorm"
 )
 
+// LocalTime 自定义时间类型，支持 null 值
+type LocalTime struct {
+	time.Time
+}
+
+func (t *LocalTime) MarshalJSON() ([]byte, error) {
+	if t == nil || t.IsZero() {
+		return []byte("null"), nil
+	}
+	formatted := fmt.Sprintf("\"%s\"", t.Format("2006-01-02 15:04:05"))
+	return []byte(formatted), nil
+}
+
+func (t *LocalTime) Value() (driver.Value, error) {
+	if t == nil || t.IsZero() {
+		return nil, nil
+	}
+	return t.Time, nil
+}
+
+func (t *LocalTime) Scan(v interface{}) error {
+	if v == nil {
+		t.Time = time.Time{}
+		return nil
+	}
+
+	switch value := v.(type) {
+	case time.Time:
+		t.Time = value
+		return nil
+	default:
+		return fmt.Errorf("unsupported type: %T", v)
+	}
+}
+
 // BaseModel 基础模型，包含自定义的创建时间和更新时间
 type BaseModel struct {
-	Id         int       `json:"id" gorm:"column:id;primaryKey;autoIncrement;common:主键ID"` // 主键 ID
-	CreateTime time.Time `json:"create_time" gorm:"column:create_time;type:datetime;autoCreateTime;common:创建时间"`
-	UpdateTime time.Time `json:"update_time" gorm:"column:update_time;type:datetime;autoUpdateTime;common:更新时间"`
-}
-
-// BeforeCreate 创建前自动设置时间
-func (b *BaseModel) BeforeCreate(tx *gorm.DB) error {
-	now := time.Now()
-	b.CreateTime = now
-	b.UpdateTime = now
-	return nil
-}
-
-// BeforeUpdate 更新前自动更新时间
-func (b *BaseModel) BeforeUpdate(tx *gorm.DB) error {
-	b.UpdateTime = time.Now()
-	return nil
-}
-
-func (b *BaseModel) AfterFind(tx *gorm.DB) error {
-	b.UpdateTime = time.Now()
-	return nil
+	Id         int        `json:"id" gorm:"column:id;primaryKey;autoIncrement;common:主键ID"` // 主键 ID
+	CreateTime *LocalTime `json:"create_time" gorm:"column:create_time;type:datetime;autoCreateTime;common:创建时间"`
+	UpdateTime *LocalTime `json:"update_time" gorm:"column:update_time;type:datetime;autoUpdateTime;common:更新时间"`
 }