The Trigger Date row appears automatically when you select a group whose name ends with "on X day (Select day on next field)" — the module groups, Delivery on X Day, Pickup on X Day and any Pickup Locations entry. Sprwt uses that date to find customers with an order for that specific day. A separate Trigger Date (To Exclude) appears when such a group is used under Exclude. For the pre-built day groups (today, tomorrow, next Monday, etc.) no date is needed.