แม่แบบ:Certification Table Entry/Sales/SwedishPeriod/doc

This helper template calculates periods for Swedish certifications, as stated in [1] and [2]

It returns:

Before October 1996	Before 2002	Before July 2003	Before November 2006	Before January 2010	Before January 2018	From January 2018
1	2	3	4	5	6	7

Returns 0 if the data provided is not sufficient.