\sffamily does not show Greek characters

Question

I have been trying to generate a timetable for my weekly schedule via a GNU SF template that I've found. As I'm Greek, I wanted the text in the schedule to be in Greek.

The template I use is Pascal Gwosdek's timetable.sty package, which generates a nice looking weekly timetable, like so:

enter image description here

The problem begins when I attempt to change the days into the Greek equivalents, in the timetables.sty package, like so:

\newcommand{\greekdays}[1]
{
    % Arguments: <number of start day>
    % Macro for the greek week days
    % added by dsfounis

    \setcounter{@day}{#1}

    \@ttforloop{@column}{1}{\value{@column} < \value{@colcount}}
    {
        \ifthenelse{\equal{\value{@day}}1}{\daymark{Δευτέρα}}{}
        \ifthenelse{\equal{\value{@day}}2}{\daymark{Τρίτη}}{}
        \ifthenelse{\equal{\value{@day}}3}{\daymark{Τετάρτη}}{}
        \ifthenelse{\equal{\value{@day}}4}{\daymark{Πέμπτη}}{}
        \ifthenelse{\equal{\value{@day}}5}{\daymark{Friday}}{}
        \ifthenelse{\equal{\value{@day}}6}{\daymark{Saturday}}{}
        \ifthenelse{\equal{\value{@day}}7}{\daymark{Sunday}}{}

        \stepcounter{@day}
        \ifthenelse{\value{@day} > 7}{\addtocounter{@day}{-7}}{}
    }
}

The result:

enter image description here

I've identified the lines that set the font for most elements of the timetable to be these ones:

% SansSerif font
\newcommand{\timetablefont}{\sffamily}
\newcommand{\@ttfont}{\timetablefont\selectfont}

Is there any way to properly show Greek characters in \sffamily? I thought Computer Modern Sans Serif included Greek symbols.

I could also change the font to Ubuntu basic, which is suitable for the timetable and looks good, but I do not know how to do this through the above 2 lines.

Minimal working example (Default template apart from the /greekdays command rewrite)

.tex:

\documentclass[a4paper,10pt]{report}

% Definitions
\usepackage{pdflscape}
\usepackage[height=25cm]{geometry}
\usepackage{timetable}
\begin{document}
\thispagestyle{empty}
\begin{landscape}
\printheading{Stundenplan 6. Semester}
% Define the layout of your time tables
\setslotsize{3.8cm}{0.3cm}
\setslotcount {5} {36}
\settextframe{0.8mm}
\setbottomstyle{\tiny}
\setbottomspace{1pt}
\setprinttimestamps{2}
\setframetype[t]{1}
\seteventcornerradius{0pt}
\definecolor{ttframecol2}{rgb}{0.9,0.9,0.9}
% Define event types
\defineevent{corelecture}{0.0} {0.28}{1.0} {1.0}{1.0}{1.0}
\defineevent{seminar} {1.0} {0.4} {0.2} {1.0}{1.0}{1.0}
\defineevent{langcourse} {1.0} {0.4} {0.2} {1.0}{1.0}{1.0}
\defineevent{tutorial} {0.6} {0.8} {1.0} {1.0}{1.0}{1.0}
\defineevent{work} {0.21}{0.5} {0.16}{1.0}{1.0}{1.0}

% Start the time table
\begin{timetable}
\hours{9}{15}{0}
\greekdays{1} %MARKER
\event 1 {1415} {1600} {Data Networks Lecture} {Druschel} {E1{\tiny3} 002} {corelecture}
\event 1 {1615} {1800} {Tutorial SysArch} {Gwosdek} {E1{\tiny3} SR014} {work}
\event 2 {0915} {1100} {Embedded Systems Lecture} {Finkbeiner} {E1{\tiny3} 003} {corelecture}
\event 2 {1115} {1300} {Differential Equations in IPCV Lecture} {Weickert} {E1{\tiny3} 001} {corelecture}
\event 2 {1415} {1600} {Office Hour SysArch} {Gwosdek} {E1{\tiny1} HaDePra} {work}
\event 3 {1415} {1600} {Data Networks Lecture} {Druschel} {E1{\tiny3} 002} {corelecture}
\event 3 {1615} {1800} {Numerical Algorithms in Image Analysis} {Bruhn, Weickert} {E1{\tiny1} 3.06} {seminar}
\event 4 {0915} {1100} {Embedded Systems Lecture} {Finkbeiner} {E1{\tiny3} 003} {corelecture}
\event 4 {1115} {1300} {Tutorial SysArch} {Gwosdek} {E1{\tiny3} SR014} {work}
\event 5 {1000} {1100} {Bremser Meeting} {SysArch United} {E1{\tiny3}} {work}
\event 5 {1115} {1300} {Differential Equations in IPCV Lecture} {Weickert} {E1{\tiny3} 001} {corelecture}
\end{timetable}
\end{landscape}
\end{document}

timetable.sty

%    timetable.sty - The LaTeX timetable stylesheet V1.4
%    http://www.planetk.de/index.php?title=Stundenplan
%
%    Copyright (C) 2007-2009 Pascal Gwosdek
%    Modifications (C) 2008 Daniel Bader
%
%    This program is free software; you can redistribute it and/or modify it
%    under the terms of the GNU General Public License as published by the
%    Free Software Foundation; either version 3 of the License, or (at your
%    option) any later version.
%
%    This program is distributed in the hope that it will be useful, but
%    WITHOUT ANY WARRANTY; without even the implied warranty of
%    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
%    Public License for more details.
%
%    You should have received a copy of the GNU General Public License along
%    with this program; if not, see <http://www.gnu.org/licenses/>.
%

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{timetable}
\RequirePackage{ifthen, calc, color}

% Preset the colors
\definecolor{ttframecol1}{rgb}{0.8,0.8,0.8}
\definecolor{ttframecol2}{rgb}{0.7,0.7,0.7}
\definecolor{ttfontcolor}{rgb}{0.0,0.0,0.0}
\definecolor{ttlinecol1}{rgb}{0.0,0.0,0.0}
\definecolor{ttlinecol2}{rgb}{0.0,0.0,0.0}

% Simple for loop construct as proposed by N. Setzer
\newcommand{\@ttforloop}[5][1]
{
  \setcounter{#2}{#3}
  \ifthenelse{#4}
  {
    #5
    \addtocounter{#2}{#1}
    \@ttforloop[#1]{#2}{\value{#2}}{#4}{#5}
  }
  {}
 }

% SansSerif font
\newcommand{\timetablefont}{\sffamily}
\newcommand{\@ttfont}{\timetablefont\selectfont}

% Dimensions
\newlength{\@rowheight}
\newlength{\@colwidth}
\newcounter{@rowcount}
\newcounter{@colcount}
\newlength{\@textframe}
\newlength{\@bottomspace}
\newlength{\@totalheight}
\newlength{\@totalwidth}
\newlength{\@toprowheight}

% Arbitrary stuff
\newcounter{@timemarks}
\newcounter{@daymarks}
\newcounter{@topheight}
\newcounter{@printtimestamps}
\newlength{\@cornerradius}
\newcounter{@frametype}
\newcounter{@framevalign}

% Predefines
\setlength{\@cornerradius}{3pt}
\setcounter{@frametype}2
\setcounter{@framevalign}2
\setlength{\@rowheight}{1.2cm}
\setlength{\@colwidth}{2.8cm}
\setlength{\@textframe}{0.8mm}
\setlength{\@bottomspace}{8pt}
\setcounter{@rowcount}9
\setcounter{@colcount}5
\setcounter{@topheight}{2}
\setcounter{@printtimestamps}{0}
\newcommand{\@bottomstyle}{\scriptsize}
\newcommand{\@timestyle}{\tiny}

% Event declarations
\newlength{\@startposx}
\newlength{\@startposy}
\newlength{\@eventheight}
\newlength{\@newcolwidth}
\newlength{\@newrowheight}
\newlength{\@newcolleft}
\newlength{\@newrowtop}

% Helpers
\newcounter{@hourslot}
\newcounter{@durationslots}
\newcounter{@minutesperslot}
\newcounter{@timetablehelp}

\newcounter{@day}
\newcounter{@column}
\newcounter{@row}
\newcounter{@hour}
\newcounter{@minute}
\newcounter{@minuteStep}
\newcounter{@startHour}
\newcounter{@startMinute}
\newcounter{@endHour}
\newcounter{@endMinute}
\newcounter{@hoursset}
\setcounter{@hoursset}{0}
\newcounter{@hourzero}

\newcommand{\seteventcornerradius}[1]
{
  \setlength{\@cornerradius}{#1}
  \ifthenelse{\strip@pt\@cornerradius > 7}
  {
    \setlength{\@cornerradius}{7pt}
  }
  {
    \ifthenelse{\strip@pt\@cornerradius < 0}
    {
      \setlength{\@cornerradius}{0pt}
    }
    {}
  }
}

\newcommand{\settopheight}[1]
{
    \addtocounter{@rowcount}{#1-\value{@topheight}}
    \setcounter{@topheight}{#1}
}

\newcommand{\setframetype}[2][c]
{
  % Set frame type
  \ifthenelse{#2 < 1}
  {
    % Lines
    \setcounter{@frametype}{1}
  }
  {
    \ifthenelse{#2 > 2}
    {
      % Checkerboard
      \setcounter{@frametype}{2}
    }
    {
      \setcounter{@frametype}{#2}
    }
  }

  % Caption vertical alignment
  \ifthenelse{\equal{#1}{b}}
  {\setcounter{@framevalign}{1}}
    {\ifthenelse{\equal{#1}{t}}
    {\setcounter{@framevalign}{0}}
    {\setcounter{@framevalign}{2}}
  }
}

\newcommand{\setprinttimestamps}[1]
{
    \setcounter{@printtimestamps}{#1}
}

\newcommand{\setbottomstyle}[1]
{
    \renewcommand{\@bottomstyle}{#1}
}

\newcommand{\settimestyle}[1]
{
    \renewcommand{\@timestyle}{#1}
}

\newcommand{\setbottomspace}[1]
{
    \setlength{\@bottomspace}{#1}
}

\newcommand{\@fmtTime}[2]
{
    % Arguments: {hour}{minute}
    \ifthenelse{\value{#1} < 10}{0}{}\arabic{#1}:\ifthenelse{\value{#2} < 10}{0}{}\arabic{#2}
}

\newcommand{\slotevent}[7]
  {
    % Arguments: {x}{y}{duration}{title}{lecturer}{place}{type}{textcolor}
    \renewcommand{\baselinestretch}{0.75}\normalsize

    \setlength{\@startposx}{#1\@colwidth+0.5pt}
    \setlength{\@startposy}{-#2\@rowheight-1.5pt}
    \setlength{\@eventheight}{#3\@rowheight-1pt}
    \addtolength{\@startposy}{-\@eventheight}

    \addtolength{\@startposx}{\@cornerradius}
    \put(\strip@pt\@startposx,\strip@pt\@startposy){\textcolor{@timetable#7block}{\rule[-\dp\strutbox]{\@colwidth-1pt-2\@cornerradius}{\@eventheight}}}
    \addtolength{\@startposx}{-\@cornerradius}
    \addtolength{\@startposy}{\@cornerradius}
    \put(\strip@pt\@startposx,\strip@pt\@startposy){\textcolor{@timetable#7block}{\rule[-\dp\strutbox]{\@colwidth-1pt}{\@eventheight-2\@cornerradius}}}
    \addtolength{\@startposy}{-\@cornerradius}

    \setlength{\@cornerradius}{2\@cornerradius}

    \ifthenelse{\strip@pt\@cornerradius > 0}
    {
      % Left rounded corners
      \addtolength{\@startposx}{.5\@cornerradius}
      \addtolength{\@startposy}{.5\@cornerradius-\dp\strutbox}
      \put(\strip@pt\@startposx,\strip@pt\@startposy){\textcolor{@timetable#7block}{\circle*{\strip@pt\@cornerradius}}}
      \addtolength{\@startposy}{-.5\@cornerradius+\dp\strutbox}
      \addtolength{\@startposy}{-.5\@cornerradius-\dp\strutbox+\@eventheight}
      \put(\strip@pt\@startposx,\strip@pt\@startposy){\textcolor{@timetable#7block}{\circle*{\strip@pt\@cornerradius}}}
      \addtolength{\@startposy}{.5\@cornerradius+\dp\strutbox-\@eventheight}
      \addtolength{\@startposx}{-.5\@cornerradius}

      % Right rounded corners
      \addtolength{\@startposx}{-.5\@cornerradius+\@colwidth-1pt}
      \addtolength{\@startposy}{.5\@cornerradius-\dp\strutbox}
      \put(\strip@pt\@startposx,\strip@pt\@startposy){\textcolor{@timetable#7block}{\circle*{\strip@pt\@cornerradius}}}
      \addtolength{\@startposy}{-.5\@cornerradius+\dp\strutbox}
      \addtolength{\@startposy}{-.5\@cornerradius-\dp\strutbox+\@eventheight}
      \put(\strip@pt\@startposx,\strip@pt\@startposy){\textcolor{@timetable#7block}{\circle*{\strip@pt\@cornerradius}}}
      \addtolength{\@startposy}{.5\@cornerradius+\dp\strutbox-\@eventheight}
      \addtolength{\@startposx}{.5\@cornerradius-\@colwidth-1pt}
    }{}

    \setlength{\@cornerradius}{0.5\@cornerradius}

    \setlength{\@newrowheight}{\@rowheight}
    \addtolength{\@newrowheight}{-2\@textframe-1pt}
    \setlength{\@newcolwidth}{\@colwidth}
    \addtolength{\@newcolwidth}{-2\@textframe-1pt}

    \setlength{\@newrowtop}{-#2\@rowheight}
    \addtolength{\@newrowtop}{-2\@textframe}
    \setlength{\@newcolleft}{#1\@colwidth+.5pt}
    \addtolength{\@newcolleft}{\@textframe}

    \ifthenelse{\value{@hoursset} = 0}{\setcounter{@printtimestamps}{0}}{}

    % Title
    \addtolength{\@newrowtop}{-1pt}
    \put(\strip@pt\@newcolleft,\strip@pt\@newrowtop)
        {\begin{minipage}[t]{\@newcolwidth}%
          \@ttfont\raggedright\color{@timetable#7text}%
            \ifthenelse{\value{@printtimestamps} > 0}%
              {{\@timestyle \@fmtTime{@startHour}{@startMinute}}%
                \ifthenelse{\value{@printtimestamps} = 2}%
                  {{\@timestyle -- \@fmtTime{@endHour}{@endMinute}}}%
                  {}%
              \\}%
              {}%
            {#4}%
         \end{minipage}}
    \addtolength{\@newrowtop}{1pt}

    \renewcommand{\baselinestretch}{0.5}\normalsize
    \setlength{\@newrowtop}{-#2\@rowheight-#3\@rowheight}
    \addtolength{\@newrowtop}{2\@textframe + \@bottomspace}

    % Lecturer
    \put(\strip@pt\@newcolleft,\strip@pt\@newrowtop)
        {\begin{minipage}[t]{0.6\@newcolwidth}%
      \@ttfont\raggedright\color{@timetable#7text}{\@bottomstyle #5%
            \vphantom{A}}
            \ifthenelse{\value{@printtimestamps} = 1}%
              {{\@timestyle \@fmtTime{@endHour}{@endMinute}}}%
              {}%
          \end{minipage}}

    \setlength{\@newcolleft}{#1\@colwidth + \@colwidth}
    \addtolength{\@newcolleft}{-\@textframe-0.4\@newcolwidth}

    % Location
    \put(\strip@pt\@newcolleft,\strip@pt\@newrowtop)
      {\begin{minipage}[t]{0.4\@newcolwidth}%
        \@ttfont\raggedleft\color{@timetable#7text}{\@bottomstyle #6%
          \vphantom{A}}%
      \end{minipage}}

    \renewcommand{\baselinestretch}{1.0}\normalsize
  }

\newcommand{\event}[7]
  {
    % Arguments: {@day}{@start}{@end}{title}{lecturer}{place}{type}

    % Use the time format, if hours are defined, and a slot number otherwise:
    \ifthenelse{\value{@hoursset} > 0}
    {
      \setcounter{@startHour}{#2 / 100}
      \setcounter{@startMinute}{#2 - #2 / 100 * 100}

      \setcounter{@endHour}{#3 / 100}
      \setcounter{@endMinute}{#3 - #3 / 100 * 100}

      \setcounter{@hourslot}{((#2 - \value{@hourzero}) / 100 * (60 / \value{@minutesperslot})) + 2 + ((#2 - #2 / 100 * 100) / \value{@minutesperslot})}
      \setcounter{@durationslots}{((#3 - \value{@hourzero}) / 100 * (60 / \value{@minutesperslot})) + 2 + ((#3 - #3 / 100 * 100) / \value{@minutesperslot}) - \value{@hourslot}}

      % Compensate for 24h wrap
      \ifthenelse{\value{@hourslot} < 0}{\addtocounter{@hourslot}{(24 * (60 / \value{@minutesperslot}))}}{}

      \addtocounter{@hourslot}{\value{@topheight}-2}
    }
    {
      \setcounter{@hourslot}{#2}
      \setcounter{@durationslots}{#3-#2}
    }

    \slotevent{#1}{\value{@hourslot}}{\value{@durationslots}}{#4}{#5}{#6}{#7}
  }

\newcommand{\legend}[3]
  {
    % Arguments: <horizontal> <vertical> <text>
    % Lets you manually set slot contents (use this really rarely and
    % SEE: \daymark, \timemark )

    \setlength{\@newrowtop}{\@rowheight*(-#2+1)-\dp\strutbox}
    \setlength{\@newcolleft}{#1\@colwidth-\@colwidth}

    \ifthenelse{\value{@hoursset} = 0}
      {\setcounter{@minutesperslot}{60}}
      {}

    % Select frame type
    \ifthenelse{\value{@frametype} = 1}
    { % Lines
      \ifthenelse{#1 = 1}{\put(\strip@pt\@newcolleft,\strip@pt\@newrowtop){\textcolor{ttframecol2}{\rule{\@colwidth}{1pt}}}}{}
      \addtolength{\@newrowtop}{-\value{@topheight}\@rowheight}
      \addtolength{\@newcolleft}{-1pt}
      \ifthenelse{#2 = 1}{\put(\strip@pt\@newcolleft,\strip@pt\@newrowtop){\textcolor{ttframecol2}{\rule{1pt}{\value{@topheight}\@rowheight}}}}{}
      \addtolength{\@newcolleft}{1pt}
      \addtolength{\@newrowtop}{\value{@topheight}\@rowheight}
    }
    { % Checkerboard
      % Horizontal stripe
      \ifthenelse{#2 = 1}
        {\setcounter{@timetablehelp}{#1 * \real{0.5} * \real{2.0}}
          \ifthenelse{\value{@timetablehelp} = #1}
            {\addtolength{\@newrowtop}{-\value{@topheight}\@rowheight}
             \put(\strip@pt\@newcolleft,\strip@pt\@newrowtop)
               {\textcolor{ttframecol2}{\rule{\@colwidth}{\value{@topheight}\@rowheight}}}
             \addtolength{\@newrowtop}{\value{@topheight}\@rowheight}
            }
            {}
        }
        {}
      % Vertical stripe
      \ifthenelse{#1 = 1}
        {\setcounter{@timetablehelp}{(((#2-\value{@topheight}-1) * \value{@minutesperslot} / 120) * 2) - ((#2-\value{@topheight}-1) * \value{@minutesperslot} / 60)}
          \ifthenelse{\value{@timetablehelp} = 0}
            {\setcounter{@timetablehelp}{60 / \value{@minutesperslot}}
             \addtolength{\@newrowtop}{-\value{@timetablehelp}\@rowheight}
             \put(\strip@pt\@newcolleft,\strip@pt\@newrowtop)
               {\textcolor{ttframecol2}{\rule{\@colwidth}{\value{@timetablehelp}\@rowheight}}}
             \addtolength{\@newrowtop}{\value{@timetablehelp}\@rowheight}
            }
            {}
        }
        {}
    }

    % Print text
    \addtolength{\@newcolleft}{\@textframe}
    \addtolength{\@newrowtop}{-\@textframe-\heightof{\large #3}}

    % Optionally move caption to middle or bottom
    \ifthenelse{\value{@framevalign} > 0}
    {
      \ifthenelse{#1 = 1}
      {
        \addtolength{\@newrowtop}{(- \@rowheight * (60 / \value{@minutesperslot}) + 2\@textframe + \heightof{\Large #3})/\value{@framevalign}}
      }
      {
        \ifthenelse{#2 = 1}
        {
          \addtolength{\@newrowtop}{(- \value{@topheight}\@rowheight + 2\@textframe + \heightof{\Large #3})/\value{@framevalign}}
        }{}
      }
    }{}

    \put(\strip@pt\@newcolleft,\strip@pt\@newrowtop){\makebox{\textcolor{ttfontcolor}{\@ttfont\large #3}}}
  }

\newcommand{\timemark}[1]
  {
    \stepcounter{@timemarks}
    \legend 1 {\value{@timemarks}} {#1}
  }

\newcommand{\daymark}[1]
  {
    \stepcounter{@daymarks}
    \legend {\value{@daymarks}} 1 {#1}
  }

\newcommand{\defineevent}[7]
  {
    \definecolor{@timetable#1block}{rgb}{#2, #3, #4}
    \definecolor{@timetable#1text} {rgb}{#5, #6, #7}
  }

\newcommand{\printheading}[1]
  {
    {\@ttfont\LARGE #1}\par\vspace{5mm}\par
  }

\newcommand{\setslotsize}[2]
  {
    % Arguments: <width> <height>
    % Defines the slot size

    \setlength{\@rowheight}{#2}
    \setlength{\@colwidth}{#1}
  }

\newcommand{\setslotcount}[2]
  {
    % Arguments: <days> <hours per day>
    % Defines the number of slots in both dimensions

    \setcounter{@colcount}{#1}
    \setcounter{@rowcount}{#2+\value{@topheight}}

    \stepcounter{@colcount}
  }

\newcommand{\settextframe}[1]
  {
    % Arguments: <width>
    % Defines the width of the border of each entry (i.e. the
    % distance between outer border and text)

    \setlength{\@textframe}{#1}
  }

\newcommand{\hours}[3]
  {
    % Arguments: <start hour> <minute stepping> <print end time?>
    % Automatically sets the time slots to full hours, beginning with <start hour>

    \setcounter{@hoursset}{1}
    \setcounter{@hourzero}{(#1 * 100)}

    \setcounter{@hour}{#1}
    \setcounter{@minute}{0}
    \setcounter{@minuteStep}{#2}
    \setcounter{@minutesperslot}{\value{@minuteStep}}

    \@ttforloop{@row}{\value{@topheight}}{\value{@row} < \value{@rowcount}}
    {
      \ifthenelse{\value{@minute} = 0}{
        \timemark{\@fmtTime{@hour}{@minute}\ifthenelse{#3 > 0}{-\setcounter{@hour}{\value{@hour}+1}\@fmtTime{@hour}{@minute}\setcounter{@hour}{\value{@hour}-1}}{}}
      }{\stepcounter{@timemarks}}
      \addtocounter{@minute}{#2}
      \ifthenelse{\value{@minute} = 60}{\stepcounter{@hour}\setcounter{@minute}{0}}{}   
      \ifthenelse{\value{@hour} > 23}{\addtocounter{@hour}{-24}}{}
    }
  }

\newcommand{\englishdays}[1]
  {
    % Arguments: <number of start day>
    % Macro for the english week days

    \setcounter{@day}{#1}

    \@ttforloop{@column}{1}{\value{@column} < \value{@colcount}}
    {
      \ifthenelse{\equal{\value{@day}}1}{\daymark{Monday}}{}
      \ifthenelse{\equal{\value{@day}}2}{\daymark{Tuesday}}{}
      \ifthenelse{\equal{\value{@day}}3}{\daymark{Wednesday}}{}
      \ifthenelse{\equal{\value{@day}}4}{\daymark{Thursday}}{}
      \ifthenelse{\equal{\value{@day}}5}{\daymark{Friday}}{}
      \ifthenelse{\equal{\value{@day}}6}{\daymark{Saturday}}{}
      \ifthenelse{\equal{\value{@day}}7}{\daymark{Sunday}}{}

      \stepcounter{@day}
      \ifthenelse{\value{@day} > 7}{\addtocounter{@day}{-7}}{}
    }
  }

\newcommand{\germandays}[1]
  {
    % Arguments: <number of start day>
    % Macro for the english week days

    \setcounter{@day}{#1}

    \@ttforloop{@column}{1}{\value{@column} < \value{@colcount}}
    {
      \ifthenelse{\equal{\value{@day}}1}{\daymark{Montag}}{}
      \ifthenelse{\equal{\value{@day}}2}{\daymark{Dienstag}}{}
      \ifthenelse{\equal{\value{@day}}3}{\daymark{Mittwoch}}{}
      \ifthenelse{\equal{\value{@day}}4}{\daymark{Donnerstag}}{}
      \ifthenelse{\equal{\value{@day}}5}{\daymark{Freitag}}{}
      \ifthenelse{\equal{\value{@day}}6}{\daymark{Samstag}}{}
      \ifthenelse{\equal{\value{@day}}7}{\daymark{Sonntag}}{}

      \stepcounter{@day}
      \ifthenelse{\value{@day} > 7}{\addtocounter{@day}{-7}}{}
    }
  }

\newcommand{\greekdays}[1]
{
  % Arguments: <number of start day>
  % Macro for the greek week days
  % added by dsfounis

  \setcounter{@day}{#1}

  \@ttforloop{@column}{1}{\value{@column} < \value{@colcount}}
  {
    \ifthenelse{\equal{\value{@day}}1}{\daymark{Δευτέρα}}{}
    \ifthenelse{\equal{\value{@day}}2}{\daymark{Τρίτη}}{}
    \ifthenelse{\equal{\value{@day}}3}{\daymark{Τετάρτη}}{}
    \ifthenelse{\equal{\value{@day}}4}{\daymark{Πέμπτη}}{}
    \ifthenelse{\equal{\value{@day}}5}{\daymark{Friday}}{}
    \ifthenelse{\equal{\value{@day}}6}{\daymark{Saturday}}{}
    \ifthenelse{\equal{\value{@day}}7}{\daymark{Sunday}}{}

    \stepcounter{@day}
    \ifthenelse{\value{@day} > 7}{\addtocounter{@day}{-7}}{}
  }
}

\newenvironment{timetable}%
  {\noindent%
    % Arguments: None
    % Starts a new timetable
    %
    % Set the new layout setting
    \setlength{\@totalheight}{-\value{@rowcount}\@rowheight}%
    \setlength{\@totalwidth}{\value{@colcount}\@colwidth}%
    %
    % Reset the counters
    \setcounter{@timemarks}{\value{@topheight}}%
    \setcounter{@daymarks}{1}%
    %
    % Minipage to correct bounding box
    \begin{minipage}[t][-\@totalheight]{\@totalwidth}
    %
    % Begin. Note the offset hack of the picture, this is to make it consistent to the old pstricks package. 
    \begin{picture}(\strip@pt\@totalwidth,\strip@pt\@totalheight)(0,-\strip@pt\baselineskip)
      % Draw the grey frame
      \put(0,\strip@pt\@totalheight){\textcolor{ttframecol1}{\rule[-\dp\strutbox]{\@colwidth}{-\@totalheight}}}
      \setlength{\@toprowheight}{\value{@topheight}\@rowheight}
      \put(0,-\strip@pt\@toprowheight){\textcolor{ttframecol1}{\rule[-\dp\strutbox]{\@totalwidth}{\@toprowheight}}}
  }
  {
      % Draw the contours
      % Inner
      \addtolength{\@colwidth}{-1pt}
      \put(\strip@pt\@colwidth,-\strip@pt\@toprowheight){\textcolor{ttlinecol2}{\rule[-\dp\strutbox]{\@totalwidth-\@colwidth+1pt}{1pt}}}
      \put(\strip@pt\@colwidth,\strip@pt\@totalheight){\textcolor{ttlinecol2}{\rule[-\dp\strutbox]{1pt}{-\@totalheight-\@toprowheight}}}
      \addtolength{\@colwidth}{1pt}

      % Outer
      \put(0,0){\textcolor{ttlinecol1}{\rule[-\dp\strutbox]{\@totalwidth}{1pt}}}
      \put(0,\strip@pt\@totalheight){\textcolor{ttlinecol1}{\rule[-\dp\strutbox]{1pt}{-\@totalheight}}}
      \put(\strip@pt\@totalwidth,\strip@pt\@totalheight){\textcolor{ttlinecol1}{\rule[-\dp\strutbox]{1pt}{-\@totalheight+1pt}}}
      \addtolength{\@totalheight}{-0.5pt}
      \put(0,\strip@pt\@totalheight){\textcolor{ttlinecol1}{\rule[-\dp\strutbox]{\@totalwidth}{1pt}}}
      \addtolength{\@totalheight}{0.5pt}
    \end{picture}

    \end{minipage}
  }

@egreg It's kind of irrelevant, since all the work in the .tex file is done by using commands in the .sty package. I have no problem with compiling, I just want to get the font to work with greek letters in these two lines in the package. Since I'm a beginner though, a minimal working example could reveal a problem that I'm missing. Adding it now. — Dimitris Sfounis, Mar 1, 2015 at 14:32

egreg · Accepted Answer · 2015-03-01 14:44:58Z

You have to add support for Greek to begin with. The simplest way is to use babel:

\documentclass[a4paper,10pt]{report}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[greek,english]{babel}

% Definitions
\usepackage{pdflscape}
\usepackage[height=25cm]{geometry}
\usepackage{timetable}
\begin{document}
\thispagestyle{empty}
\begin{landscape}
\printheading{Stundenplan 6. Semester}
% Define the layout of your time tables
\setslotsize{3.8cm}{0.3cm}
\setslotcount {5} {36}
\settextframe{0.8mm}
\setbottomstyle{\tiny}
\setbottomspace{1pt}
\setprinttimestamps{2}
\setframetype[t]{1}
\seteventcornerradius{0pt}
\definecolor{ttframecol2}{rgb}{0.9,0.9,0.9}
% Define event types
\defineevent{corelecture}{0.0} {0.28}{1.0} {1.0}{1.0}{1.0}
\defineevent{seminar} {1.0} {0.4} {0.2} {1.0}{1.0}{1.0}
\defineevent{langcourse} {1.0} {0.4} {0.2} {1.0}{1.0}{1.0}
\defineevent{tutorial} {0.6} {0.8} {1.0} {1.0}{1.0}{1.0}
\defineevent{work} {0.21}{0.5} {0.16}{1.0}{1.0}{1.0}

% Start the time table
\begin{timetable}
\hours{9}{15}{0}
\greekdays{1} %MARKER
\event 1 {1415} {1600} {Data Networks Lecture} {Druschel} {E1{\tiny3} 002} {corelecture}
\event 1 {1615} {1800} {Tutorial SysArch} {Gwosdek} {E1{\tiny3} SR014} {work}
\event 2 {0915} {1100} {Embedded Systems Lecture} {Finkbeiner} {E1{\tiny3} 003} {corelecture}
\event 2 {1115} {1300} {Differential Equations in IPCV Lecture} {Weickert} {E1{\tiny3} 001} {corelecture}
\event 2 {1415} {1600} {Office Hour SysArch} {Gwosdek} {E1{\tiny1} HaDePra} {work}
\event 3 {1415} {1600} {Data Networks Lecture} {Druschel} {E1{\tiny3} 002} {corelecture}
\event 3 {1615} {1800} {Numerical Algorithms in Image Analysis} {Bruhn, Weickert} {E1{\tiny1} 3.06} {seminar}
\event 4 {0915} {1100} {Embedded Systems Lecture} {Finkbeiner} {E1{\tiny3} 003} {corelecture}
\event 4 {1115} {1300} {Tutorial SysArch} {Gwosdek} {E1{\tiny3} SR014} {work}
\event 5 {1000} {1100} {Bremser Meeting} {SysArch United} {E1{\tiny3}} {work}
\event 5 {1115} {1300} {Differential Equations in IPCV Lecture} {Weickert} {E1{\tiny3} 001} {corelecture}
\end{timetable}
\end{landscape}
\end{document}

The definition of \greekdays should be

\newcommand{\greekdays}[1]
{%
  % Arguments: <number of start day>
  % Macro for the greek week days
  % added by dsfounis
  %
  \setcounter{@day}{#1}%
  %
  \@ttforloop{@column}{1}{\value{@column} < \value{@colcount}}
  {%
    \ifthenelse{\equal{\value{@day}}1}{\daymark{\textgreek{Δευτέρα}}}{}%
    \ifthenelse{\equal{\value{@day}}2}{\daymark{\textgreek{Τρίτη}}}{}%
    \ifthenelse{\equal{\value{@day}}3}{\daymark{\textgreek{Τετάρτη}}}{}%
    \ifthenelse{\equal{\value{@day}}4}{\daymark{\textgreek{Πέμπτη}}}{}%
    \ifthenelse{\equal{\value{@day}}5}{\daymark{Friday}}{}% %%%%FIX HERE!
    \ifthenelse{\equal{\value{@day}}6}{\daymark{Saturday}}{}% %%%%FIX HERE!
    \ifthenelse{\equal{\value{@day}}7}{\daymark{Sunday}}{}% %%%%FIX HERE!
    %
    \stepcounter{@day}%
    \ifthenelse{\value{@day} > 7}{\addtocounter{@day}{-7}}{}%
  }%
}

I believe it should be in the document preamble, rather than a change in the timetable.sty file. Precede the code by \makeatletter and follow it by \makeatother, in this case. Why? Because if the package author changes it, you'll lose your change.

enter image description here

Thank you for your swift reply and suggestions :3 Unfortunately, I get the same result when I compile your code. Plus, a compiler warning. i.imgur.com/sg3mDI9.png — Dimitris Sfounis, Mar 1, 2015 at 14:52
@DimitrisSfounis egreg's code is for pdftex, but your image shows an error from xetex. — David Carlisle, Mar 1, 2015 at 15:06
@DavidCarlisle updating MiKTeX and recompiling with pdftex now. — Dimitris Sfounis, Mar 1, 2015 at 15:10
@egreg Finally updated by MiKTeX and compiled with pdftex. Your code works as I wanted. Thank you very, very much. — Dimitris Sfounis, Mar 1, 2015 at 15:28

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