If you're applying for JEE Advanced under the OBC NCL category, the official guidelines state your certificate must be issued on or after April 1st, 2023. One user's certificate, signed by officials on dates spanning from February to April 2023, raises concerns about its validity based on this rule. It's recommended to obtain a fresh certificate issued after April 1st to avoid issues with your application and ensure you can avail the OBC NCL benefits.