well in that case you have an alternative, which requires a little more effort, but will probably do exactly what you need.
Let me assume you have a master M.
Now you create a job that calculates the date in format YYYYMMDD; Something like "date +%Y%M%d" would do the job.
You then use the output to set a result parameter (called CTODAY), e.g.
sdms-set_variable --host $SDMSHOST --port $SDMSPORT --jid $JOBID --key $KEY CTODAY `date +%Y%M%d`
Now you add the new Job to your master M as a child and make sure it runs first.
Alternatively you can create a structure like
CALC_TODAY ---> M
The next step is to create a parameter TODAY that is a childreference to the Parameter CTODAY of CALC_TODAY.
From here on, you can use TODAY as a parameter in all Jobs below M.