I-94 extension for 1 day

[nad]

Hello i have a question regarding I-94 extension for one day on B2 visa. My parents came to US and were not able to travel by last star given on I-94, however they are traveling next day. Would like to know if i still have to file extension for I-94. Any inputs will be helpful

[jnk]

It's better to file extension. Information on visitor visa extension,

https://www.immihelp.com/usa-visitors-visa-extension-application-documents/

If you don't extend their I-94 their visa is void and would need to apply for it all over again.

If you don't they can try to visit the USA again, take chances and hope for the best.