vertical text problem in table

Question

I'm making a planning for some report, and used the LaTeX table generator to change it from Excel to LaTeX. However, if I'm running the generated code, the vertical text gets split up, which I don't want, see image below. Does one of you know how to solve this issue? I want the week number columns to have equal spacing, but cannot manage to do this. I guess it is also the problem with the combination with merged rows and merged columns...

code (only first month):

\usepackage{makecell}
\usepackage{multirow}
\usepackage{colortbl}


\begin{table}
\centering
\begin{tabular}{|c|lllll|} 
\hline
\multicolumn{1}{|r|}{Week number} & 1                                                                         & 2 & 3 & 4 & 5  \\ 
\hline
\multicolumn{1}{|r|}{Month}       & \multicolumn{5}{l|}{January}                                                               \\ 
\hline
\multicolumn{1}{|l|}{Item}        &                                                                           &   &   &   &    \\ 
\hline
1                                 & {\cellcolor[rgb]{0.753,0.753,0.753}}                                      &   &   &   &    \\
2                                 & {\cellcolor[rgb]{0.753,0.753,0.753}}                                      &   &   &   &    \\
3                                 & {\cellcolor[rgb]{0.753,0.753,0.753}}                                      &   &   &   &    \\
4                                 & {\cellcolor[rgb]{0.753,0.753,0.753}}                                      &   &   &   &    \\
5                                 & {\cellcolor[rgb]{0.753,0.753,0.753}}                                      &   &   &   &    \\
6                                 & {\cellcolor[rgb]{0.753,0.753,0.753}}                                      &   &   &   &    \\
7                                 & {\cellcolor[rgb]{0.753,0.753,0.753}}                                      &   &   &   &    \\
8                                 & {\cellcolor[rgb]{0.753,0.753,0.753}}                                      &   &   &   &    \\
9                                 & {\cellcolor[rgb]{0.753,0.753,0.753}}                                      &   &   &   &    \\
A                                 & \multirow{-10}{*}{{\cellcolor[rgb]{0.753,0.753,0.753}}\rotcell{Holidays}} &   &   &   &    \\
\hline
\end{tabular}
\end{table}

Answer 1

You can use \rotatebox. Replace the command \multirow{-10}{*}{{\cellcolor[rgb]{0.753,0.753,0.753}}\rotcell{Holidays}} with

\parbox[t]{5mm}{\multirow{-10}{*}{\cellcolor[rgb]{0.753,0.753,0.753}\rotatebox[origin=c]{90}{Holidays}}}

and it should work. The 5mm set the width of your gray column.