Can I add a script to Google Spreadsheets to add a certain amount to a particular cell every month?

Well I am trying to track my expenses and it's getting a little annoying to track the monthly spendings on services. Is there a script I can add so each cell that needs to be updated monthly by the same ammount will be updated automatically?

Maybe you can do that with Zapier somehow?

Its possible with a google script (written in javascript) that can be run on a monthly trigger. So I guess if you cant find another way you could hire a freelancer.