I wrote these utility extension methods to get the previous quarter end/month end and next quarter end/month end values for Financial calculations. Next Quarter End: 1: public static DateTime NextQuarterEnd(this DateTime date) 2: { 3: IEnumerable<DateTime> candidates = 4: QuartersInYear(date.Year).U... + 1)); 5: return candidates.Where(d => d.Subtract(date).Days > 0).First(); 6: } 7: 8: public static IEnumerable<DateTime> QuartersInYear(int year) 9: { 10:...