Dear student,

A category certificate is valid for one year and atmost for two years.
So, if you have a category certificate four years older then it can not be used in jee mains.

But there is no such information about the format or valid date is given in the jee mains information bulletin for any category certificate.

So as for reference, I advise you to check that for jee advanced 2020, the category certificate must be issued on or after April 2020.

So you can get a basic idea from this that to which date you should make your obc category certificate. So, you should make a make an obc certificate and upload it which was issued after april 2020 or in this month ( just to remain on more safer side ).
And this certificate must be signed by district magistrate or deputy commissioner or any other competent authority in your area.

Also of you have passed in 2019 or 2020 or will be passing your class 12th in 2021 then you are eligible for jee mains. If you upload the wrong category certificate then you can correct in the correction window. Otherwise you have to give jee mains exam with general category

Also here is the link so that you might get an idea of the obc certificate format that was used in 2020 for counseling :-
https://josaa.nic.in/webinfo/File/GetFile?FileId=11&LangId=P

Also check out the following link to know more about jee mains 2021 :-
https://engineering.careers360.com/articles/jee-main-application-form/amp

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