Help with UTD acceptance deadline

Hi all. I’m trying to understand the deadlines for UTD acceptance. I’m not able to find the date by which I should accept/reject the offer.

Even the i20 form right. I don’t see any deadline by which I need to submit this information.

I just get mails asking me to submit official copies of the transcripts. Received 2 such mails.

Can someone with a UTD admit help me figure out this information? TIA.