Answer by Noah Heldman for Cron job to run on the last day of the month

Some cron implementations support the "L" flag to represent the last day of the month.

If you're lucky to be using one of those implementations, it's as simple as:

0 55 23 L * ?

That will run at 11:55 pm on the last day of every month.

http://www.quartz-scheduler.org/documentation/quartz-1.x/tutorials/crontrigger