Trade Time Help Automatic Subtraction
 

I am wanting to create a Trade Time log for my company. The catch is I want
it to drop the time from a Total Column I will create 6 months from the date
that time was added to the total.

So I added 5 hours on January first I want the 5 hours to subtract
autmatically 180 days from January first and continue to do that everytime a
credit is entered.