To transform the date and time 'Data_Enrolled' from Daylight Savings time and fall back one hour, the developer should use the following AMPscript function:
%%=DateAdd(Data_Enrolled, -1, 'H')=%%
This function subtracts one hour from the 'Data_Enrolled' date and time.
References:
Salesforce Marketing Cloud AMPscript Date Functions
Salesforce Marketing Cloud Documentation