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Template:Certification Table Entry/Sales/PolishPeriod/doc

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This helper template calculates periods for Polish certifications, according to the sources from ZPAV article:

  • The dates for the changes up to 2010[1]
  • Removing the foreign/domestic distinction in June 2015[2]

References

  1. ^ Skubikowska, Zofia (February 23, 2010). "Re: Interested in changes of Poland's certification-award-levels". Letter to Anonymous.
  2. ^ "ZPAV :: Bestsellery i wyróżnienia - Wyróżnienia - Regulamin 01.06.2015". bestsellery.zpav.pl. Archived from the original on 2015-06-26. Retrieved 26 August 2021.

It returns:

Before April 1997 Before June 2002 Before June 2004 before June 2006 Before June 2015 From June 2015
1 2 3 4 5 6

Returns 0 if the data provided is not sufficient.