\begin{tabular}
Start time&forecast time\\
months since 1960-01-01&months since 1960-01-01\\
0000 1 Oct 2016&Nov 2016 - Feb 2017\\
0000 1 Oct 2017&Nov 2017 - Feb 2018\\
0000 1 Oct 2018&Nov 2018 - Feb 2019\\
0000 1 Oct 2019&Nov 2019 - Feb 2020\\
\end{tabular}