In the Rule block, add the following:
set $(DATE) printDate("%d %B %Y", now())
In Action, you can define "%(CURRENT_DATE)" as part of the subject
Under static parameters:
The same can also be used within the email body, under _FORMAT.
***The DATE and CURRENT_DATE is user defined, they can be other names
***The format for the date is defined within the printDate function, for more info, please refer to the Help section
*** the userdata definition must be within the rule block's "if" statement.