When does the EAD filing 180 days start from?

Hi All,
I have one question. The H4EAD extension says we can only apply within 180 days of expiry.
My question is when the clock starts
a. Date we fill the online form
b. The date we send the post
c. The date they receive the post in USCIS
Thanks again

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Date you submit the online form or date when USCIS receives the mail.

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Thanks Kalpesh. Do you know if we can submit all the related documents also via online or it is via post( as it was introduced recently, Iā€™m not aware of the process yet)