\ProvidesFile{iso-authoryear.bbx}[2011/06/08]
\newcommand\MethodFormat{}
\def\printextrayear{\newunit\newblock\printfield{year}\printfield{extrayear}}
\newbibmacro*{year-label}{\ifnameundef{author}{\ifnameundef{editor}{}{\printextrayear}}{\printextrayear}}
\ExecuteBibliographyOptions{%
  %spacecolon=true
   sorting=nyt
}
\RequireBibliographyStyle{iso}