how to find year and month difference between two dates?

DateTime dayStart;
DateTime dateEnd;

TimeSpan ts = dateEnt - dateStart;开发者_StackOverflow

Print : ... Year(s) and ... Month(s)

how can I calculate it?

.net framework 2.0

c#

asp.net project.

You should first read this article from Jon Skeet, specially from the text "Introducing periods and period arithmetic" it gets interesting for you.

So, you have to define when a certain period is a change in month, in year etc.

Noda-time already contains a lot of functions for this. But I don't think it is released yet.

Following will calculate the age in years, months, days

        DateTime dob = "10/18/1981";  // date of birth
        DateTime now = DateTime.Now;

        // Swap them if one is bigger than the other
        if (now < dob)
        {
            DateTime date3 = now;
            now = dob;
            dob = date3;
        }
        TimeSpan ts = now - dob;
        //Debug.WriteLine(ts.TotalDays);

        int years = 0;
        int months = 0, days=0;
        if ((now.Month <= dob.Month) && (now.Day < dob.Day))  // i.e.  now = 03Jan15,  dob = 23dec14  
        {
            // example: March 2010 (3) and January 2011 (1); this should be 10 months.  // 12 - 3 + 1 = 10
            years = now.Year - dob.Year-1;
            months = 12 - dob.Month + now.Month-1;
            days = DateTime.DaysInMonth(dob.Year, dob.Month) - dob.Day + now.Day;

            if(months==12)
            {
                months=0;
                years +=1;
            }
        }
        else if ((now.Month <= dob.Month) && (now.Day >= dob.Day)) // i.e.  now = 23Jan15,  dob = 20dec14  
        {
            // example: March 2010 (3) and January 2011 (1); this should be 10 months.  // 12 - 3 + 1 = 10
            years = now.Year - dob.Year - 1;
            months = 12 - dob.Month + now.Month;
            days = now.Day - dob.Day;
            if (months == 12)
            {
                months = 0;
                years += 1;
            }
        }
        else if ((now.Month > dob.Month) && (now.Day < dob.Day))  // i.e.  now = 18oct15,  dob = 22feb14  
        {
            years = now.Year - dob.Year;
            months = now.Month - dob.Month-1;
            days = DateTime.DaysInMonth(dob.Year, dob.Month) - dob.Day + now.Day;
        }
        else if ((now.Month > dob.Month) && (now.Day >= dob.Day))  // i.e.  now = 22oct15,  dob = 18feb14  
        {
            years = now.Year - dob.Year;
            months = now.Month - dob.Month;
            days = now.Day - dob.Day;
        }
        Debug.WriteLine("Years: {0}, Months: {1}, Days: {2}", years, months, days);

That depends on what you want to calculate exactly.

You can't translate the value in a TimeSpan to exact years and months, as the length of years and months varies. You can calculate approximate years and months like this:

int years = ts.Days / 365;
int months = (ts.Days % 365) / 31;

If you want the exact difference, you have to compare the DateTime values.

I think something like this would do it:

  DateTime date1 = new DateTime(1973, 07, 20);
  DateTime date2 = new DateTime(2010, 01, 10);

  // Swap them if one is bigger than the other
  if (date2 < date1)
  {
    DateTime date3 = date2;
    date2 = date1;
    date1 = date3;
  }

  // Now date2 >= date1.

  TimeSpan ts = date2 - date1;

  // Total days
  Console.WriteLine(ts.TotalDays);

  // Total years
  int years = date2.Year - date1.Year;

  int months = 0;
  // Total monts
  if (date2.Month < date1.Month)
  {
    // example: March 2010 (3) and January 2011 (1); this should be 10 monts
    // 12 - 3 + 1 = 10
    // Take the 12 months of a year into account
    months = 12 - date1.Month + date2.Month;
  }
  else
  {
    months = date2.Month - date1.Month;
  }
  Console.WriteLine("Years: {0}, Months: {1}", years, months);

Edit To clarify: There's no need for complicated date algorhitms or any of that kind of stuff, because there are always 12 months in a year (at least in our calendar).