Looking for something really simple that probably exists,

Looking for something really simple that probably exists, just haven't found the right search terms. I am looking for a plug in, or widget, that will allow me to show a nicely formatable counter, changing in real time increasing at a specified rate, a rate that can be easily changed.

So for instance, most of my sites are about shelter pets. about 3 million cats and dogs are killed in our shelters each year. I would like the plug in to simply let me set a counter to say count to AnyCountNumber (3 million) over TimePeriod (365 days) starting on a StartDate (January 1) and/or ending on a EndDate (December 31).

I see count down plugins, but most of them wouldn't work even if I knew how to change the plugin to count up. Do you know any?