initial skeleton

still working out parsing the input
parse dates correctly

wasn't catching first/last date because format not strptime friendly.
split by hand to get DateTime->new constructor parameters.
datemath

figured out how that works
perl and arry of hashes

reminded myself (after probably a decade) how to work with "array of
hashes" -- they are hash references
data maipulations

we'll need a "round to 5pm" logic
datemath working

now i've got an array of events in a form that I can plot
makes a picture!

generates the svg image now.  Still missing: labels so hu-mans can
actually understand what it's trying to show.