If there is no date on the Rolex warranty card, you need to contact Rolex after-sales customer service and provide specific purchase information for more accurate information and guidance. If the warranty card only has a term (such as one year) and has no starting time, it needs to be "activated" after purchase to start calculating the validity period of the insurance. For example, if you bought it yesterday but didn't activate it, the insurance still doesn't take effect. If it is activated tomorrow (for example, February 2023 19), the insurance is valid from tomorrow to the day before the next year (for example, February 2024 18).

Please note that the above information is based on general experience, and the specific warranty policy may vary by brand, model and region. Therefore, if you have any questions or problems, you'd better consult and confirm directly with Rolex official after-sales service center or authorized after-sales service center.