def METHOD_NAME(self):
    """
    Updates notification datetime for user
    ---
    tags:
      - notifications
    produces:
      - application/json
    parameters:
        - in: header
          name: Authorization
          description: Base64 encoded session token
          required: true
          type: string
          default: Token sessionTokenHere==
    responses:
        404:
            description: Notification not found.
        200:
            description: Message info
        500:
            description: Internal Server Error
    """
    user_id = token_auth.current_user()
    unread_count = NotificationService.update(user_id)
    return unread_count, 200