Requested Start / Wait until (dynamic date)

[Rick Sample]

4.6C
 
I have a need to delay a message (SENDTASKDESCRIPTION) until a given date (not seconds).
Basically we want to delay a send message at the end of a WF on a given "dynamic" date. 
Get an effective date from container and pass to a method / background task, whatever to 
then send the message. I looked at creating a method "WAIT UP TO xxx SECONDS." But I would rather not 
have to calculate seconds from days and not sure what impact this would have on the system.
We are not currently using Deadline monitoring.
 
Any given Demos or examples of this type I can look?
 
Any help is appreciated.
 
Thanks!