/// <summary>
/// The number of complete months in the period, return a double value.
/// </summary>
/// <param name="start"></param>
/// <param name="end"></param>
/// <returns></returns>
public static double ExactMonthDiff(DateTime start, DateTime end)
{
DateTime _start, _end;
if (start <= end)
{
_start = start;
_end = end;
}
else
{
_start = end;
_end = start;
}
var diff = PrivateMonthDiff(_start, _end);
var endStart = start.AddCompleteMonths(diff);
var endEnd = endStart.AddCompleteMonths(1);
return(diff + (end - endStart).TotalDays / (endEnd - endStart).TotalDays);
}
