Is DATEADD supported in DESelect Segment?

Question: Is DATEADD supported in DESelect Segment?

Answer: Yes, DATEADD can be used in the Custom Values section (Target Data Extension step) using the Custom Value > Apply formula to a field > Transform date. 

Example: You want to give a voucher to customers on their birthday, that would be valid on the next 30 days. You want to create a field with the expiration date, by adding 30 days to the customer's birthday