Biblatex: Change date/year output for one literature-type only

Question

I have a book that uses footnotes and several bibliographies, and includes books, articles and the like. Ordinarily, the citation style author-year and along the lines of "Author (Year), Title, Publisher." I use a code fragment to adapt the standard biblatex style so that I get parenthesis around the year for all literature types (see MWE). However, I have one literature type (misc2) that I created to cover court rulings (as misc one is used for legal documents that otherwise don't fit in the biblatex types). These are, unlike the rest, supposed to look like this: "EuG v. 15.6.2000, Rs. T-298/07, T-312/97, Slg. 2000, II-2325 -- Alzetta" (Court v. Date, Title).

I want to adapt only the type misc 2 to show the year field in "v. YEAR" instead of "(YEAR)". How can I adapt my code for that purpose?

MWE:

\documentclass[graybox,envcountchap,sectrefs]{svmono}
\usepackage[autocite=footnote, language=german, style=authoryear-ibid, sorting=nyt, backend=biber]{biblatex}
\usepackage[bottom]{footmisc}
\bibliography{lit.bib}
\makeindex
%command for generally putting parenthesis around year/date
\renewbibmacro*{cite:labelyear+extrayear}{%
\iffieldundef{labelyear}
  {}
  {\ifentrytype{misc}
    {
        \printtext[bibhyperref]{%
        %\printtext[parens]{%
        %\printfield{labelyear}%
        %\printfield{extrayear}}
        }}  
    {
        \printtext[bibhyperref]{%
        \printtext[parens]{%
        \printfield{labelyear}%
        \printfield{extrayear}}
        }}
   }
   }
\begin{document}

Test Document Group 1 (book)\autocite[2]{draftnotice}.


"Misc" is used for other legal documents, "Misc 2" is distinct and used for court rulings:


Test Document Group 2 (Misc2)\footnote{\fullcite{eugh29807}.} 


What Test Document Group 2 is supposed to be like\footnote{EuG v. 15.6.2000, Rs. T-298/07, T-312/97, Slg. 2000, II-2325 -- Alzetta}

\end{document}

My lit.bib

@book{draftnotice,
    Author = {{Karl Marx}},
    Howpublished = {Capital},
    Year = {1867}}

@misc2{eugh29807,
    Author = {{EuG}},
    Howpublished = {Rs. T-298/07, T-312/97, Slg. 2000, II-2325 -- Alzetta},
    Year = {15.6.2000}}

And a picture to show what i mean:

Answer 1

You can use \DeclareFieldFormat for this, which allows formatting on a per-entry type. (I've changed your documentclass to article, since I don't have your class).

Note: This is a temporary answer, which although it works has some problems as noted in the comments. I will update with a better solution.

\documentclass[]{article}
\begin{filecontents}{\jobname.bib}
@book{draftnotice,
    Author = {{Karl Marx}},
    Howpublished = {Capital},
    Year = {1867}}

@misc2{eugh29807,
    Author = {{EuG}},
    Howpublished = {Rs. T-298/07, T-312/97, Slg. 2000, II-2325 -- Alzetta},
    Year = {15.6.2000}}
\end{filecontents}
\usepackage[autocite=footnote, language=german, style=authoryear-ibid, sorting=nyt, backend=biber]{biblatex}
\usepackage[bottom]{footmisc}
\bibliography{\jobname.bib}

%command for generally putting parenthesis around year/date
\renewbibmacro*{cite:labelyear+extrayear}{%
\iffieldundef{labelyear}
  {}
  {\printtext[bibhyperref]{%
   \printtext[parens]{%
   \printfield{labelyear}%
   \printfield{extrayear}}%
   }}%
   }

\DeclareFieldFormat[misc2]{parens}{v. #1\addcomma}
\begin{document}

Test Document Group 1 (book)\autocite[2]{draftnotice}.


"Misc" is used for other legal documents, "Misc 2" is distinct and used for court rulings:


Test Document Group 2 (Misc2)\footnote{\fullcite{eugh29807}.} 


What Test Document Group 2 is supposed to be like\footnote{EuG v. 15.6.2000, Rs. T-298/07, T-312/97, Slg. 2000, II-2325 -- Alzetta}

\end{document}