how to make a rolling calender where hours roll off after a year
 

I want to put vacation/sick day hours into a calendar that renew after one
year. This is what I would call a rolling calendar. So if I take two hours
off on February 15, 2005 and 3 hours off in April 20, 2005 the calendar
automatically puts my time back on the two anniversary days. So that would be
a total of 5 hours. If you know of a template I can use send that link.