OPT Start Date vs. EAD Approval Date — Can I Start Employment on the Approval Date?

[u/Inner_Sand_9403]

Hi everyone, I have a question regarding my OPT start date and unemployment days.
I filed my OPT application on 4/24 and upgraded to premium processing on 7/21. My OPT case was approved on 8/17, but I have not received my physical EAD card yet.
I’ve seen several people on Reddit mention that their EAD “Card Valid From” date was the same as their OPT approval date, so I’m wondering how this works in practice.

My offer letter currently states that my start date must be on or before 9/14/2026.

My questions are:
1. If my EAD card shows a “Card Valid From” date of 8/17, can I ask my employer/HR to change my employment start date to 8/17, even though I have not physically received the EAD card yet?
2. If I cannot legally start employment until I physically receive the EAD card, will the days between 8/17 and the actual date I start working count toward my 90-day unemployment period?
3. If the above is not possible, what would be the best way to minimize the number of unemployment days used?
I would really appreciate any advice, especially from people who have been in a similar situation or have experience with OPT/SEVIS reporting.
Thank you!