protected double YearsTo(DateTime endDate, Loan loan)
{
var beginDate = loan.GetToday().HasValue ? loan.GetToday().Value : loan.GetStart().Value;
var beginDateMilliseconds = new DateTimeOffset(beginDate).ToUnixTimeMilliseconds();
var endDateMilliseconds = new DateTimeOffset(endDate).ToUnixTimeMilliseconds();
return(((endDateMilliseconds - beginDateMilliseconds) / MillisPerDay) / DaysPerYear);
}
