make
sudo make install
See
worktime --help
Today's calendar: worktime > today.xhtml
The rest of the work week: worktime -w --end $(date --date "Friday" +%Y-%m-%d) > week.xhtml
December 31, 2011: worktime --start 2011-12-31 --end 2011-12-31 > holiday.xhtml
Weekdays of December 2011: worktime --weekdays --start 2011-12 --end 2011 > Dec.xhtml
Next weekend: worktime --weekends --end $(date --date "Monday" +%Y-%m-%d) > weekend.xhtml