แม่แบบ:Certification Table Entry/Sales/HongKongPeriod

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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
• [3] current certification. [4] showing it was active on Jan 2008, [5] showing it wasn't on Dec 2007, so change occurred Jan 2008.

There is no data for the interim period

It returns:

Before 2006	Before October 2007	Before 2008	From 2008
1	2	3	4

Returns 0 if the data provided is insufficient