C#

// required
using System.Globalization;

private DateTimeFormatInfo dtf = new DateTimeFormatInfo();

// DateTime 1, DateTime 2 => Dictionary<string, int>
// assumes DateTime 2 is later than DateTime 1
// for the first month: days are calculated as the number of days in the month minus current day
// for the last month: days are taken from the current day in the last month

private Dictionary<string, int> getMonthDays(DateTime d1, DateTime d2)
{
    int nMonths = ((d2.Year - d1.Year) * 12) + d2.Month - d1.Month - 1;

    var dctMonthDays = new Dictionary<string, int>();

    for (int i = 0; i <= nMonths; i++)
    {
        int daysInMonth = DateTime.DaysInMonth(d1.Year, d1.Month);
        string monthName = dtf.GetMonthName(d1.Month);

        if (i == 0)
        {
            dctMonthDays.Add(monthName, daysInMonth - d1.Day);
        }
        else if (i == nMonths)
        {
            dctMonthDays.Add(monthName, d2.Day);
        }
        else
        {
            dctMonthDays.Add(monthName, daysInMonth);
        }

        d1 = d1.AddMonths(1);
    }

    return dctMonthDays;
}

// test in a method or EventHandler
DateTime d1 = DateTime.Now;

DateTime d2 = d1.AddMonths(7);

var monthDayDiff = getMonthDays(d1, d2);

foreach (var kvp in monthDayDiff)
{
    Console.WriteLine("Month: {0} Days: {1}", kvp.Key, kvp.Value);
}

// result of test in Console Window on Nov. 11, 2014
// Month: November Days: 19
// Month: December Days: 31
// Month: January Days: 31
// Month: February Days: 28
// Month: March Days: 31
// Month: April Days: 30
// Month: May Days: 11

Member 10948508 wrote:

If I wanted to post

Member 10948508 wrote:

I would have done so

Member 10948508 wrote:

But nobody is replying me.

Sergey Alexandrovich Kryukov wrote:

Also, it does not address Bill's issue

Sergey Alexandrovich Kryukov wrote:

You did not even explain your opinion.

Sergey Alexandrovich Kryukov wrote:

Voter always right?

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]