Question

What I would like to do is as follows

Given two dates e.g. March 02, 1998 and September 25, 2011. How to get split the interval into

1. March 02, 1998 to March 31, 1998 ( 30 Days)
2. April 01, 1998 to December 31, 1998 ( 9 Months)
3. January 01, 1999 to December 31, 2010 ( 11 Years)
4. January 01, 2011 to August31, 2011 ( 8 Months)

5. September 01, 2011 to September 25, 2011 ( 30 Days)

   However if any of the interval doesn’t exist, we don’t wan to force include it i.e. the result will not always be days/months/years/months/days e.g.

   Given start date = ‘1998-02-01’ and end date = ‘2011-03-31’,
   The expect results is (Months/Years/Months)

   1998-02-01 ==> 1998-12-31
   1999-01-01 ==> 2010-12-31
   2011-01-01 ==> 2011-03-31

   Given start date = ‘1998-02-01’ and end date = ‘1998-03-31’,
   The expect results is (2 Months)

   1998-02-01 ==> 2011-03-31

   Given start date = ‘1998-01-05’ and end date = ‘1998-02-03’,
   The expect results is (Days/Days)
   1998-01-05 ==> 2011-01-31
   1998-02-01 ==> 2011-02-03

Have a look at the following in case my description does not make sense. I am trying to accomplish the same but in .net

Algorithm to find optimal day/month/year intervals to in an arbitrary timeframe?

Answer 1

You can just do like this:

DateTime startDate = new DateTime(1998, 3, 2);
DateTime endDate = new DateTime(2011, 9, 25);

DateTime firstMonth = new DateTime(startDate.Year, startDate.Month, 1).AddMonths(1);
DateTime firstYear = new DateTime(startDate.Year + 1, 1, 1);
DateTime lastYear = new DateTime(endDate.Year, 1, 1);
DateTime lastMonth = new DateTime(endDate.Year, endDate.Month, 1);

Console.WriteLine("{0:yyyy-MM-dd} - {1:yyyy-MM-dd}", startDate, firstMonth.AddDays(-1));
Console.WriteLine("{0:yyyy-MM-dd} - {1:yyyy-MM-dd}", firstMonth, firstYear.AddDays(-1));
Console.WriteLine("{0:yyyy-MM-dd} - {1:yyyy-MM-dd}", firstYear, lastYear.AddDays(-1));
Console.WriteLine("{0:yyyy-MM-dd} - {1:yyyy-MM-dd}", lastYear, lastMonth.AddDays(-1));
Console.WriteLine("{0:yyyy-MM-dd} - {1:yyyy-MM-dd}", lastMonth, endDate);

Output:

1998-03-02 - 1998-03-31
1998-04-01 - 1998-12-31
1999-01-01 - 2010-12-31
2011-01-01 - 2011-08-31
2011-09-01 - 2011-09-25