[R] trouble with small multiples on a date variable

[davideps]

Hello,

I am loading a DBF file into R via JGR and am having trouble creating small
multiple histograms on a date variable. Hist() handles the variable
correctly. But I've been unable to work with lattice or ggplot2 despite
trying format() and as.POSIXct(). Dates are in the format "2010-05-15" and
the grouping variable is categorical. I'd appreciate it if someone would
provide an example.

Thank you,
-david