Question

Possible Duplicate:
Calculate Years, Months, weeks and Days

How do I calculate difference in years and months given a start and end date?

Hi

Working on a c# 2.0 project and I need to calculate the difference in years and months given the start and end date

I was thinking of a function like

        public void CalculateYearsAndMonths(DateTime startDate,
                                            DateTime endDate,
                                            out int years,
                                            out int months)
        {
            int years=0;
            int months=0;

            //????
        }

any suggestions?

Answer 1

This code works even when number of days between two dates are 365 days. E.g. 29th February 1972 and 28. February 1973, then it will return 0 years and 11 months.

if (endDate < startDate)
{
    DateTime temp = endDate;
    endDate = startDate;
    startDate = temp;
}

years = endDate.Year - startDate.Year;
months = endDate.Month - startDate.Month;
int days = endDate.Day - startDate.Day;
if (days < 0) months--;
if (months < 0)
{
    months += 12;
    years--;
}

By the way, you need to remove the two lines to make the out parameters work correctly:

int years=0;
int months=0;