%%[
VAR @date, @email
SET @email = EmailAddress /*This is the column name for email address that you have used in your DE*/
SET @date = Lookup('Data Extension name here','Date column name here that you have used in your Data Extension','Email Address column name here that you have used in your Data Extension',@email) /*To populate date value from your DE for the user to whom email will be sent*/
]%%

%%=FormatDate("@date", "DD MMMM YYYY")=%%