First H4 ead validity start date

If I apply my first H4 EAD along with premium H1B H4 Extension (ex. Oct 2019) What will be start date of H4 EAD? Will it be from the date of H4 EAD approval (ex. Dec 2019)
or from date of my current H1B (I-94) expiry? ( ex. Feb 2019).
If it is Feb 2019, can I request some where to be Dec 2019.

Continuing the discussion from First H4 ead validity start date:

Thank you for the quick response!!

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