Weekday-Basis Seasonal Factors: Weekdays for Calculation (G17MVSFWWKDAYS)

Source: Board of Governors of the Federal Reserve System (US)  

Release: Seasonal Factors for Domestic Auto and Truck Production  

Units:  Per Month, Not Seasonally Adjusted

Frequency:  Monthly

The number of weekdays, or production days, in a month, alongside unadjusted motor vehicle assembly data from Table 3 of the G17, and the weekly-basis seasonal factors (SFW) are applied using the formula here.