Please don't. Oatmeal is wonderful (except for the sugar stuffed varieties), but subsisting on carbs only for an entire week is ridiculous. What are your goals, weight loss? If so, one week is not nearly enough time, and it's always best to have small, but nutritionally-balanced meals.
Yellowstone County, Montana. Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2010 census, the population was 147,972, and a 2014 estimate put the population at 155,634. Its county seat is Billings.
The length of the day in Billings varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 40 minutes of daylight; the longest day is June 21, with 15 hours, 43 minutes of daylight.