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1. Get the Timestamp
Open this page:
https://member.bilibili.com/x2/creative/h5/calendar/event?ts=0
Press CTRL+F, type jointime, and the number after jointime is your timestamp.
Copy the timestamp.
2. Convert the Timestamp
Go to this website: Timestamp (Unix timestamp) Converter – Online Tool
Enter the timestamp in the designated field and click convert.
References
How an UP shows you how to check your Bilibili registration time, precise to the second! Bilibili