code: func (engine *Engine) NoAutoTime() *Session {
  	session := engine.NewSession()
  	session.isAutoClose = true
  	return session.NoAutoTime()
  }
docs: // NoAutoTime Default if your struct has "created" or "updated" filed tag, the fields
  // will automatically be filled with current time when Insert or Update
  // invoked. Call NoAutoTime if you dont' want to fill automatically.