How is 90 days defined for iEAD?

[rockstone]

My wife's pending EAD RD: 9/17, ND: 9/19. When can we apply for iEAD? How do they count 90 days, from RD or from ND? Also count day by day or month by month? We plan to go on 12/19, is that ok? Thanks.

 

[ginnu]

90 days from RD