that' s not what You asked to start with ...
but from the opc point of view
//*%OPC BEGIN ACTION=INCLUDE,COMP=(&ODAY..EQ.1)
will check if the day of week is 1 ==> monday
When I tell somebody to RTFM or STFW I usually have the page open in another tab/window of my browser,
so that I am sure that the information requested can be reached with a very small effort