Calculating the number of business/working days in a month excluding holidays,

[LookerUserSU]

Hello,

Does anyone know if and how this can be done in Looker and what would be the best way of achieving this?
Basically, I have a dashboard built for our sales team that displays several metrics including yesterday’s sales, MTD sales…
One thing I’m missing is the projected sales volume for the month.
The formula for this is pretty simple, (current MTD volume / number of working sales days so far in the month) / total number of sales/working/business days which would exclude holidays.
This last part, total number of business days, is what I’m having trouble calculating.
Is this something that can be done in Looker?

Thanks,