in excel, what is the formula that will add a number each month
 

Excel 2007 XP O/S
I am working with a work schedule, Each month I get one sick day so I would
like the first of each month 10 (hours) be added to a cell I have set up with
my sick leave. I would also like this to top out (stop) at 720.

I would also like for the same day each year for one cell to be
automatically be added to another. I get 190 hours of vacation each year. I
would like that 190 hours be automatically added to my remaining vacation
leave.