Re: Advice on boxes plot and setting xrange with a time axis

> Right, thanks for that the range is correct. It is possible to set the  
> time labels to be abbreviated month names?

you had this command already in your first example:
set format x "%b"

> Changing the second set timefmt "%m" doesn't make any difference?
timefmt specifies how data are read in.

to get month-tics do:

set xtics 60*60*24*31
unset mxtics