# TikZ Calendar - lines under day nodes

I have modified code given by cfr in the answer to this question about current day nodes. I want different colored (green and red) lines at the bottom and left of each day. However, for the single digit dates, the bottom line does not completely fill the area I want underlined.

I think I should be able to use the = modifier on d to insert the missing space where the zero would go, but I can't make it work. Do I need to modify the definition of week list to accomplish this?

\documentclass[border=10pt,multi,tikz]{standalone}
\usetikzlibrary{calendar}
\begin{document}
\begin{tikzpicture}
\calendar (cal)
[%
week list,
dates=2016-08-01 to 2016-10-last,
day xshift=1.5em,
month xshift=1pt,
month label above left,
]
if (weekend) [text=black!25]
[%
execute at end day scope={%
\draw[red]
(cal-\%y0-\%m0-\%d0.north east) --
(cal-\%y0-\%m0-\%d0.south east);
}][%
execute at end day scope={%
\draw[green]
(cal-\%y0-\%m0-\%d0.south east) --
(cal-\%y0-\%m0-\%d0.south west);
}];
\end{tikzpicture}
\end{document}


[Note: This is one of two questions about modifying the same code. The other is here.]

1. Approach

You can use an if statement to check if the day is less then 10 and then increase the length of the line.

Code-snippet (using tikzlibrary calc):

\ifnum \%d0<10
\draw[yellow]
(cal-\%y0-\%m0-\%d0.south east) --
($(cal-\%y0-\%m0-\%d0.south west) + (-1.6mm,0)$);
\else
\draw[green]
(cal-\%y0-\%m0-\%d0.south east) --
(cal-\%y0-\%m0-\%d0.south west);
\fi


But in the result even the green original line is to long (look at 9):

2. Approach

So another approach would be to use a fix length for that line:

\documentclass[border=10pt,multi,tikz]{standalone}
\usetikzlibrary{calendar}

\begin{document}
\begin{tikzpicture}
\calendar (cal)
[%
week list,
dates=2016-08-01 to 2016-10-last,
day xshift=1.5em,
month xshift=1pt,
month label above left,
]
if (weekend) [text=black!25]
[%
execute at end day scope={%
\draw[red]
(cal-\%y0-\%m0-\%d0.north east) --
(cal-\%y0-\%m0-\%d0.south east);
}][%
execute at end day scope={%
\draw[green]
(cal-\%y0-\%m0-\%d0.south east) --++
(-5.2mm,0);
}];
\end{tikzpicture}
\end{document}


Result: