I need a countdown that shows days to go AND how many days you have behind you!!?

My husband is at basic training, and I am looking for a website or countdown application available to the general public that will allow me to set up a countdown that will show me the days to go AND show me how many I've made it through!! I'm sure I've seen these before, I am just having no luck finding anywhere to make one of these. Thank you so much for any help!