Subtracting dates

1996mustang ✭✭
edited 12/09/19 in Smartsheet Basics

I have an excel sheet that subtracts dates.  The formula is as follows: 

=IF(P4="","",NETWORKDAYS(P4,Q4)-SIGN(NETWORKDAYS(P4,Q4))) This formula works.  

When I use it in Smartsheets, the formula is as follows. 

=IF([POC Date (Planned)]3="","",NETWORKDAYS([POC Date (Planned)]3,[Actual/Pending Date]3-SIGN(NETWORKDAYS([POC Date (Planned)]3,[Actual/Pending Date]3)))

I get a response of (UNPARSEABLE)

Any thoughts on what I am doing wrong? 

Best Regards,