Template:Certification Table Entry/Sales/PolishPeriod

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This helper template calculates periods for Polish certifications, as stated in [1] and [2]. The first source was given priority as it is more public.

It returns:

Before April 1997 Before June 2002 Before June 2004 Before July 2005 From July 2005
1 2 3 4 5

Returns 0 if the data provided is not sufficient.