102 inches is legal, but that must include your side mirrors too. Wide body motorhomes have the body being 102 inches and the mirrors can stick out at least another foot on each side. How far you can stray from the interstate varies by state.
Sometimes, you need to know exactly how many years, months and days between two dates, in this situation, the following long formula may help you. 1. Years,  & DATEDIF(B1,B2,YM) &  Months,  & DATEDIF(B1,B2,MD) &  Days. Note: In the above formula, B1 indicates the start date and B2 stands for the end date, you can modify them as you need.
If you see a negative sign before date difference it means, the End Date is from past than the Start Date. By this way you may also calculate how many days has since any date. In vice versa, the calculator can be used to calculate how many days until any calendar date or event. For more specific countdowns to any specific date with other useful details and website embeddable counters, use below search box by entering required dates in following Day Month Year format, example; 14 August 2016.