List the months between two dates

Question

I would like to know when given start and end dates, how can the months and year(s) between the two dates be retrieved.

Eg: Start Date: \'1/1/2011\'(mm/dd/yyyy

Answer 1

You can utilize Linq by employing Enumerable.Range(startIndex, endIndex).
Example below:

    private string[] GetMonthsBetweenDates(DateTime deltaDate, int TotalMonths)
{
    var monthsBetweenDates = Enumerable.Range(0, TotalMonths)
                                       .Select(i => deltaDate.AddMonths(i))
                                       .OrderBy(e => e)
                                       .AsEnumerable();

    return monthsBetweenDates.Select(e => e.ToString("MMM")).ToArray();
}

The code above should produce the following results, assuming the current month is November.

Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct

Answer 2

You can start off with a while loop where the start date is less than or equal to the end date

Within it pull out the relevant Month and year part from the start date and store them (maybe you have a concrete class or a as a ), then increment the start date by 1 month using AddMonths(1)

//something on these lines 
while(startdate <= enddate)
{
// pull out month and year
startdate = startdate.AddMonths(1);
}

Answer 3

You can use Enumerable.Range function to get the month and year between two dates,

var start = new DateTime(2011, 1, 1);
var end = new DateTime(2011, 11, 30);

var diff = Enumerable.Range(0, 13).Select(a => start.AddMonths(a))
           .TakeWhile(a => a <= end)
           .Select(a => String.Concat(a.ToString("MMMM") + ", " + a.Year));

Answer 4

Here we go

    public static IEnumerable<Tuple<string, int>> MonthsBetween(
            DateTime startDate,
            DateTime endDate)
    {
        DateTime iterator;
        DateTime limit;

        if (endDate > startDate)
        {
            iterator = new DateTime(startDate.Year, startDate.Month, 1);
            limit = endDate;
        }
        else
        {
            iterator = new DateTime(endDate.Year, endDate.Month, 1);
            limit = startDate;
        }

        var dateTimeFormat = CultureInfo.CurrentCulture.DateTimeFormat;
        while (iterator <= limit)
        {
            yield return Tuple.Create(
                dateTimeFormat.GetMonthName(iterator.Month),
                iterator.Year);                
            iterator = iterator.AddMonths(1);
        }
    }

And obviously you call it like this

var startDate = DateTime.ParseExact("01/01/2011", "MM/dd/yyyy");
var endDate = DateTime.ParseExact("11/30/2011", "MM/dd/yyyy");

var months = MonthsBetween(startDate, endDate);

The results should be something like

{
    {  "January", 2011  },
    {  "February", 2011  },
    {  "March", 2011  },
    {  "April", 2011  },
    {  "May", 2011  },
    {  "June", 2011  },
    {  "July", 2011  },
    {  "August", 2011  },
    {  "September", 2011  },
    {  "October", 2011  },
    {  "November", 2011  },
}

The month names being dependent on your culture which, I think, is exactly what you asked for, right?

Answer 5

Use this formula :

((date1.Year - date2.Year) * 12) + date1.Month - date2.Month

And u get the number of months .

Use this in an appropriate way and you will crack it.

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