I'm starting with these examples:

I'm looking to add a red bar under and possibly through the numbers indicating a multiday event. I'm interested in how to do this both within a week, and also over weekends (where wraparound would be an issue).


This is not an answer but an attempt to clarify your question. All I did was to copy the code from your second link and to add some basic thingy that I adapted drom p. 526 of the pgfmanual. This allows me to draw a red bar.

% An example how to use the calendar library and modify the layout, i.e. put
% Sunday as the first week day.
% Author: Berteun Damman

    % This way you can define your own conditions, for example, you
    % could make something as `full moon', `even week', `odd week',
    % et cetera. In principle. The math in TeX could be hard.
    \pgfkeys{/pgf/calendar/start of year/.code={%

    % Define our own style
    \tikzstyle{week list sunday}=[
        % Note that we cannot extend from week list,
        % the execute before day scope is cumulative
        execute before day scope={%
               \ifdate{day of month=1}{\ifdate{equals=\pgfcalendarbeginiso}{}{
               % On first of month, except when first date in calendar.
        execute at begin day scope={%
            % Because for TikZ Monday is 0 and Sunday is 6,
            % we can't directly use \pgfcalendercurrentweekday,
            % but instead we define \c@pgf@counta (basically) as:
            % (\pgfcalendercurrentweekday + 1) % 7
                \advance\c@pgf@counta by 1
            % Shift to the right position for the day.
        execute after day scope={
            % Week is done, shift to the next line.
        % This should be defined, glancing from the source code.

    % New style for drawing the year, it is always drawn
    % for January
    \tikzstyle{year label left}=[
        execute before day scope={
            \ifdate{start of year}{
        % Right align
        every year/.append style={

    % Style to force giving a month a year label.
    \tikzset{draw year/.style={
        execute before day scope={
            \ifdate{day of month=1}{\drawyear}{}

    % This actually draws the year.
        % \tikzyearcode is defined by default


    % The actual calendar is now rather easy:
    \begin{tikzpicture}[every calendar/.style={
            month label above centered,
            month text={\textit{\%mt}},
            year label left,
            every year/.append style={font=\Large\sffamily\bfseries,
            if={(Sunday) [blue!70]},
            week list sunday,
        \matrix[column sep=1em, row sep=1em] {
            \calendar[dates=2018-04-01 to 2018-04-last,draw year]; &
            \calendar[dates=2018-05-01 to 2018-05-last]; &
            \calendar[dates=2018-06-01 to 2018-06-last]; \\
            \calendar[dates=2018-07-01 to 2018-07-last]; &
            \calendar[dates=2018-08-01 to 2018-08-last]; &
            \calendar (mycal) [dates=2018-09-01 to 2018-09-last]; \\
            \calendar[dates=2018-10-01 to 2018-10-last]; &
            \calendar[dates=2018-11-01 to 2018-11-last]; &
            \calendar[dates=2018-12-01 to 2018-12-last]; \\
            \calendar[dates=2019-01-01 to 2019-01-last]; &
            \calendar[dates=2019-02-01 to 2019-02-last]; &
            \calendar[dates=2019-03-01 to 2019-03-last]; \\
    \draw[red] (mycal-2018-09-20.south west) -- (mycal-2018-09-22.south east);  
    \draw[red] (mycal-2018-09-23.south west) -- (mycal-2018-09-24.south east);  

enter image description here

Is your question how to replace the two draw commands by a single macro?

  • Thank you, that does essentially answer my question: I was unfamiliar with the syntax for: \draw[red] (mycal-2018-09-23.south west) -- (mycal-2018-09-24.south east); Any chance you could also point me to how I could make the line thicker and change its height? I saw I could use \draw[red] (oct-2018-10-08.mid west) -- (oct-2018-10-12.mid east); the mid command, but I'm looking for something like north-north-mid. – Mittenchops Sep 20 '18 at 2:45
  • 1
    @Mittenchops You can choose the line width to be e.g. thick, \draw[red,thick]... or ultra thick, or say \draw [line width=2pt,red]..... Then, if you say \draw[red,very thick] ([yshift=2pt]mycal-2018-09-20.south west) -- ([yshift=2pt]mycal-2018-09-22.south east); this will move the line up by 2pt, if you use -2pt it will move down by the same amount. I also think it will be not too difficult do define a style/macro for that. So if you append some information what you precisely want to your nice question (and ping me again) I'll be happy to give it a shot. – marmot Sep 20 '18 at 2:50

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