Template:Certification Table Entry/Sales/MexicanPeriod

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This helper template calculates periods for Mexican certifications, as stated in AMPROFON#Sales certificates

It returns:

Until December 31, 1998 Until December 31, 1999 Until June 30, 2003 Until December 31, 2007 Until June 30, 2009 From July 1, 2009
1 2 3 4 5 6

Returns 0 if the data provided is not sufficient.