I looked at my order confirmation email from last year, and it was emailed to me Wed night/Thurs morning at 12:28am. So shortly after midnight (eastern time).
50% off SRP on all Scream Factory branded Blu-rays. Doesn't include preorders. Sale ends 6/19 at 10am pacific / 1pm eastern time.
https://cart.shoutfactory.com/landing/scream