How to set Task Reminder Date/Time using apex in Salesforce?

When creating a recurring task using Apex, how I can set the reminder to get the same functionality as what UI offers?

The Task object has only a “ReminderDateTime”!

Task t = new Task();

t.Subject = ‘Test’;

t.IsReminderSet = true;

t.RecurrenceType = ‘RecursEveryWeekday’;

t.RecurrenceDayOfWeekMask = 62;

t.ReminderDateTime = ??