Template:Certification Table Entry/Sales/BelgianPeriod

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This helper template calculates periods for Belgian certifications, as stated in the following source:

• [1] - certification until 2006
• [2] - certification from October 2007 (active at least from April 2007 [3])
• [4] - certification from 2009 (changed on April 2008 [5])
• [6] - certification from July 2018

There is no data for the interim period

It returns:

Before 2006	Before April 2007	Before April 2008	before July 2018	from July 2018
1	2	3	4	5

Returns 0 if the data provided is insufficient