The easiest thing to do is to choose a citation style where this is already implemented. For example, the commonly used authoryear citation style:
\documentclass{article}
\usepackage{filecontents}
\begin{filecontents}{\jobname.bib}
@misc{t100b,
author = {Interbrand},
title = {{Best Global Brands 2012}},
howpublished = "\url{http://www.interbrand.com/en/best-global-brands/2012/Best-Global-Brands-2012-Brand-View.aspx}",
year = {2012},
note = "Visited the 19/12/2012"
}
\end{filecontents}
\usepackage[style=authoryear,natbib=true,backend=biber]{biblatex}
\addbibresource{\jobname.bib}
\begin{document}
\cite{t100b}
\printbibliography[title={Internet}, type=misc]
\end{document}
Running pdflatex, biber, pdflatex will give you this output:

Which has the year before the note.
If you'd like a different style just look through your $TEXMFLOCAL/tex/latex/biblatex/bbx directory (or the parallel one on Win/Mac) to see what styles you have available there.
If you can't find anything that suits you, you might have to design your own style. Looking in standard.bbx will show you that misc is defined like this:
\DeclareBibliographyDriver{misc}{%
\usebibmacro{bibindex}%
\usebibmacro{begentry}%
\usebibmacro{author/editor+others/translator+others}%
\setunit{\labelnamepunct}\newblock
\usebibmacro{title}%
\newunit
\printlist{language}%
\newunit\newblock
\usebibmacro{byauthor}%
\newunit\newblock
\usebibmacro{byeditor+others}%
\newunit\newblock
\printfield{howpublished}%
\newunit\newblock
\printfield{type}%
\newunit
\printfield{version}%
\newunit
\printfield{note}%
\newunit\newblock
\usebibmacro{organization+location+date}%
\newunit\newblock
\usebibmacro{doi+eprint+url}%
\newunit\newblock
\usebibmacro{addendum+pubstate}%
\setunit{\bibpagerefpunct}\newblock
\usebibmacro{pageref}%
\newunit\newblock
\usebibmacro{related}%
\usebibmacro{finentry}}
copying this to a new .bbx file and switching around the fields should get you your desired output. Just don't forget to initiate the file with the following lines:
\ProvidesFile{my_style.bbx}% replace this with your style name
\RequireBibliographyStyle{standard}% replace this with the style you'd like to build upon
notefield for the visited date, you could probably replace this with theurldatefield, which take the date only in the same format as thedatefield would, and will behave as you want. but then again, as you are using biblatex, I would use the@onlineentry and replace thehowpublishfield with theurlone (and no need to enclose the actual url in\url{}) as well. – ArTourter Dec 21 '12 at 0:39