When I create an ARB subscription, it seems in the mornings we get a "Start Date must not occur before the submission date." error. Which makes absolutely no sense!
We use UTC for the startDate value and support has told me their servers are on MST - so when the request goes in Authnet is probably setting the "submission date" using MST - but if UTC Is 7 hours ahead of MST, it should be valid. ALL THE TIME!
Anyone else have this problem? I've searched the forums to make sure this hasn't been discussed already.
Regardless of what's going on, you shouldn't set the first ARB payment as the same day and hope the credit card processes properly. You should do the first charge immediately using AIM and then set ARB to start a month from now.