\begin{tabular}{lx{15mm}x{15mm}x{15mm}x{15mm}x{15mm}}
\midrule
Date &  A &  B &  C &  D \tabularnewline
\midrule
   X &  1 &  2 &  3 &  4 \tabularnewline
   Y &  5 &  6 &  7 &  8 \tabularnewline
   Z &  9 &  0 &  1 &  2 \tabularnewline
\midrule
\end{tabular}
