How do I include current date in libemail.so email subject?

In the Rule block, add the following:

set $(DATE) printDate("%d %B %Y", now())
userdata "CURRENT_DATE" $(DATE)

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.