Question

The language I am using is C#.

I have the folowing dillema.

DateTime A, DateTime B. If A < B then I have to calculate the number of days per year in that timespan and multiply it by a coeficient that corresponds to that year.
My problem is the fact that it can span multiple years.

For example:

Nr of Days in TimeSpan for 2009 * coef for 2009 + Nr of Days in TimeSpan for 2010 * coef for 2010 + etc

Answer 1

Here is a little snippet of code that might help

    var start = new DateTime(2009, 10, 12);
    var end = new DateTime(2014, 12, 25);

    var s = from j in Enumerable.Range(start.Year, end.Year + 1 - start.Year)
            let _start = start.Year == j ? start : new DateTime(j, 1, 1)
            let _end = end.Year == j ? end : new DateTime(j, 12, 31)
            select new { 
                year = j,
                days = Convert.ToInt32((_end - _start).TotalDays) + 1                    
            };