Agencies maintain separate files and separate schedules for each media.
There is a standard calendar and a proposal offered by the AAAA, which is also followed by Nielsen. The differences first become apparent in March 2001 and continue thereafter. Click to see the sample calendar. For invoicing, request from all vendors that invoices be generated following the standard broadcast calendar for all media except national networks, who traditionally use a Gregorian calendar. The Netpak Writer will soon include an option to report by the Nielsen calendar, which matches the AAAA calendar.