The following principles are usually followed to determine the application date for trademark registration:

1. First-to-file principle: The application date for trademark registration is based on the first-to-file principle, that is, the earliest date of submission of a trademark registration application. If multiple applicants apply for registration of the same trademark, the Trademark Office will give priority to the earliest trademark registration application submitted.

2. Complete application principle: The application date for trademark registration means that the trademark application document contains all necessary documents and information, and the corresponding application fees are paid. The application date for trademark registration can only be determined if the application documents are complete and meet the requirements of the Trademark Office.

3. Priority principle: Under some international conventions and agreements, trademark applicants can enjoy priority. If you submit a trademark registration application in a certain country or region, and then submit an application for the same trademark in another country or region within a certain period of time, you can enjoy the application date in the first country or region as the priority date. This priority date is also considered the filing date for trademark registration.

The above are the general principles for determining the date of trademark registration application. Specific regulations may vary depending on national or regional trademark laws and trademark office regulations. During the trademark registration process, it is recommended that you consult your local trademark office, trademark agency or intellectual property lawyer to understand the specific application date determination principles and related requirements.

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