Users can sign up for Daily, Weekly or Monthly notifications. Notifications always go out immediately after the end of each period. In other words, Daily notifications are sent at around 12:01 AM every day. Weekly notifications are sent out every Sunday at around 12:01 AM. Monthly notifications are sent every 1st of the month at around 12:01 AM. Current server time (as of page load) is: June 6, 2021 4:04 PM.
The Notification portal is here.