new Date("Tue Mar 14 2017 16:02:21 GMT+0800 (中国标准时间)").getTime()

• 你的原有格式是啥格式？ YYYY-MM-DD HH:mm:ss ???

const model = sequelize.define('model', {//columns specifications
  createdAt: {
      type : TYPE.DATE,
      allowNull : false,
      get() {
        const createAt = this.getDataValue('createAt')
        // createAt is an instance of date, you could operate it with moment library
        // to get ur format
        return createAt
      },
      set(createAt) {
        return this.setDataValue('createAt',createAt)
      }
    }
 }, {
  // options
  timestamps: true // the createdAt and updatedAt will be stored by YYYY-MM-DD HH:mm:ss
});

• 如果你对数据库进行crud的操作都是通过sequelize的话，应该没问题