Can Android support dp's less than 1dp?

I am making a calendar and I need a grid. Problem is the borders, or rather the space between each grid, which is what I am using to kind of simulate a grid, is 1 dp. But its rather thick. I am looking at other calendar apps that have the borders, and they are very thin. Even if I were to use a drawable shape and make it 1dp, it still has that thickness. I tried using .5, but that did not seem to work. Is that not possible?