I have not written the name and date on my passport size photograph attached to jee mains application form
No that's not a big issue as at the time of verification at examination centre the examiners will only verify your photograph.However you can edit it when jee will provide a link for correction on their website.
All the best!:)

GO to :
https://www.jeemain.nic.in
and on the left side there is tab called remove despracny from photograph.You have to correct your photo from it.
Best Public Engineering Institutes 2025
Discover the top public engineering colleges in India beyond IITs and NITs for 2025. Get insights on placements, eligibility, application process, and more in this comprehensive ebook.