the respondent must submit the defense materials to the trademark office within 3 days from the date of receiving the trademark objection. According to Article 1 of the Regulations for the Implementation of the Trademark Law, if the parties directly submit the defense and relevant evidential materials, the submission date shall prevail; By post, the postmark date shall prevail. If the postmark date is unclear or there is no postmark, the date actually received by the Trademark Office shall prevail. The last legal holiday can be extended by one day. However, unless the parties can provide evidence of the actual postmark date.