This helper template calculates periods for Danish certifications, as stated in the following sources:

  • [१] - levels changed in April 2003
  • [२] - new levels for albums and singles in February 2007
  • [३] - new levels for singles active in September 2010
  • [४] - new albums levels change in 7 January 2011
  • [५] - new single levels from 17 November 2014
  • [६] - new single levels from 1 April 2016

It returns:

Before April 2003 Before February 2007 Before September 2010 Before 7 January 2011 Before 17 November 2014 Before 1 April 2016 From 1 April 2016
1 2 3 4 5 6 7

Returns 0 if the data provided is not sufficient.