Thanks. This is what I ended up doing awhile ago:
|gentimes start=-365 end=0 increment=1d
|eval endtime=case(strftime(now(),"%A")="Saturday",endtime - (1*86400),strftime(now(),"%A")="Sunday",endtime - (2*86400),strftime(now(),"%A")="Monday",endtime - (3*86400),strftime(now(),"%A")="Tuesday",endtime - (4*86400),strftime(now(),"%A")="Wednesday",endtime - (5*86400),strftime(now(),"%A")="Thursday",endtime - (6*86400),strftime(now(),"%A")="Friday",endtime - (7*86400))
|eval Date=strftime(endtime,"%m-%d-%Y")
|eval day_of_week = strftime(endtime,"%A")
|where NOT (day_of_week="Saturday" OR day_of_week="Sunday")
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