Is there a built in Function in calculation manager for calculating total weeks based on 5 days inst

@calcmgrweeksbetween

Is there a work days function to calculate number of weeks based on a 5 day work week?

I currently am using @calcmgrweeksbetween function with the start and end date parameters but it's based on 7 days a week.

    start_date = "Start Date";

    end_date = "End Date";

    "Weeks" = @CalcMgrWeeksBetween({start_date}, {end_date});

Currently using PBCS (cloud service)