How to convert number of days to years,months and days [duplicate]

Answer 1

As mentioned in previous answers, it is very difficult to work this out from just a number of days. There is problems with leap years, and the number of days in months. If you start with the original two datetimes you can use code similar to the following:

DateTime date1 = new DateTime(2010, 1, 18);
DateTime date2 = new DateTime(2013, 2, 22);

int oldMonth = date2.Month;
while (oldMonth == date2.Month)
{
     date1 = date1.AddDays(-1);
     date2 = date2.AddDays(-1);
}       

int years = 0, months = 0, days = 0, hours = 0, minutes = 0, seconds = 0, milliseconds = 0;

// getting number of years
while (date2.CompareTo(date1) >= 0)
{
     years++;
     date2 = date2.AddYears(-1);
}
date2 = date2.AddYears(1);
years--;


// getting number of months and days
oldMonth = date2.Month;
while (date2.CompareTo(date1) >= 0)
{
     days++;
     date2 = date2.AddDays(-1);
     if ((date2.CompareTo(date1) >= 0) && (oldMonth != date2.Month))
     {
          months++;
          days = 0;
          oldMonth = date2.Month;
     }
}
date2 = date2.AddDays(1);
days--;

TimeSpan difference = date2.Subtract(date1);

Console.WriteLine("Difference: " +
                    years.ToString() + " year(s)" +
                    ", " + months.ToString() + " month(s)" +
                    ", " + days.ToString() + " day(s)");

Output is:Difference: 3 year(s), 1 month(s), 4 day(s)