Hi,
I use the following header to my statements made with tittlesec package.

\makeatletter

    \newcommand{\@classe}[1]{}
    \newcommand{\classe}[1]{\gdef\@classe{#1}}
    \newcommand{\@typedevoir}[1]{}
    \newcommand{\typedevoir}[1]{\gdef\@typedevoir{#1}}
    \newcommand{\@numerodevoir}[1]{}
    \newcommand{\numerodevoir}[1]{\gdef\@numerodevoir{#1}}
    \AtBeginDocument{\section{\@typedevoir\space\no\@numerodevoir}}
    \titleformat{\section}[frame]
      {\normalfont}
      {\footnotesize\enspace\itshape\@classe\enspace--\enspace Le
\@date\enspace}
      {10pt}
      {\Large\scshape\bfseries\filcenter}
  \makeatother

I want to gradually move to ConTeXt and I tried to create the same header.
But I do not yet know all the commands to do with ConTeXt.

\setuptextrules
[style=\it,location=top]
\define[6]\MyHeader{%

\textrule[top]{#1\space--\space\date[d=#2,m=#3,y=#4]}{\startlinealignment[middle]{\cap
\bf #5 \space n\high{{o}}\space {#6}}\stoplinealignment\blank\textrule}}

\starttext
\MyHeader{Seconde GTA}{11}{1}{2014}{Devoir de Mathématiques}{7}
\stoptext
Thank you.