jmettraux/rufus-scheduler — pull request #46 by asdavey (2013-02-14 12:35:10+00:00)
Title: Add support for last day of month in cron expression

See http://en.wikipedia.org/wiki/Cron#CRON_expression . It mentions
that some distributions of crontab recognize L as a special character
denoting the last day of the month.