The xmtics command converts the x-axis tic marks to months of the year where 1=Jan and 12=Dec. Overflows are converted modulo 12 to months. The tics are returned to their default labels by xmtics. Similar commands perform the same duties for the other axes.
Syntax:
set xmtics
unset xmtics
show xmtics
The same syntax applies to x2mtics, ymtics, y2mtics, zmtics and cbmtics.
See also the `set format` command.