User:Muhandes/Certification Table Entry/Sales/DanishPeriodHelper2/doc

This is a helper template for Certification Table Entry/Sales/DanishPeriod, see its documentation.

Variables

 * – year of certification/release
 * – month of certification/release
 * – month of certification/release

Return values
Based on these sources:


 * - Album level changed in 1994
 * - levels changed in April 2003
 * - new levels for albums and singles in February 2007
 * new levels for singles changed in April 2009
 * - new albums levels change in 7 January 2011
 * - new single levels from 17 November 2014
 * - new single levels from 1 April 2016

It returns:

Returns 0 if the data provided is not sufficient.