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copied!<p>Here is some code I just wrote to calculate the difference in years, months, and days. It is in the public domain.</p> <pre><code> public sealed class DateDifference { int years; public int Years { get { return years; } } int months; public int Months { get { return months; } } int days; public int Days { get { return days; } } public override string ToString() { return string.Format("[DateDifference Years={0}, Months={1}, Days={2}]", years, months, days); } public DateDifference(DateTime earlier, DateTime later){ if(later<earlier) throw new ArgumentException("later is earlier than 'earlier'."); bool isleapday=(earlier.Month==2 && earlier.Day==29); DateTime tmp=isleapday ? new DateTime(earlier.Year,2,28) : earlier; while(true){ try { tmp=tmp.AddYears(1); if(isleapday && DateTime.IsLeapYear(tmp.Year)) tmp=new DateTime(tmp.Year,2,29); } catch(ArgumentOutOfRangeException){ break; } if(tmp<=later){ years++; earlier=tmp; } else { break; } } // Add months tmp=earlier; while(true){ try { tmp=tmp.AddMonths(1); if(isleapday && tmp.Day!=29 && tmp.Month!=2) tmp=new DateTime(tmp.Year,tmp.Month,29); } catch(ArgumentOutOfRangeException){ break; } if(tmp<=later){ months++; earlier=tmp; } else { break; } } tmp=earlier; while(true){ try { tmp=tmp.AddDays(1); } catch(ArgumentOutOfRangeException){ break; } if(tmp<=later){ days++; earlier=tmp; } else { break; } } } } </code></pre> <p>Example:</p> <pre><code>var dd=new DateDifference(new DateTime(2010,6,29),new DateTime(2012,2,29)); Console.WriteLine(dd.Years); // displays 1 Console.WriteLine(dd.Months); // displays 8 Console.WriteLine(dd.Days); // displays 0 </code></pre>

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