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days-in-month
Combined from primary sources listed below.

In role Dateish§

See primary documentation in context for method days-in-month 

method days-in-month(Dateish:D: --> Int:D)

Returns the number of days in the month represented by the Dateish object:

say Date.new("2016-01-02").days-in-month;                # OUTPUT: «31␤» 
say DateTime.new(:year<10000>, :month<2>).days-in-month; # OUTPUT: «29␤»