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Posted By

calebt on 08/19/09


Tagged

AGE


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umang_nine


Fractional Age

 / Published in: C#
 

Calculates fractional age and takes leap years into accounts. I've seen a lot of calculations that divide the total number of days old someone is by 365.25. This fails if the person is born on a leap year and today is not a leap year as it would return a fractional value less than a whole number.

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  1. private static double GetAge(DateTime birthDate, DateTime today)
  2. {
  3.       // get the last birthday
  4.       int years = today.Year - birthDate.Year;
  5.       DateTime last = birthDate.AddYears(years);
  6.       if (last > today)
  7.       {
  8.             last = last.AddYears(-1);
  9.             years--;
  10.       }
  11.       // get the next birthday
  12.       DateTime next = last.AddYears(1);
  13.       // calculate the number of days between them
  14.       double yearDays = (next - last).Days;
  15.       // calcluate the number of days since last birthday
  16.       double days = (today - last).Days;
  17.       // calculate exact age
  18.       double exactAge = (double)years + (days / yearDays);
  19.       return exactAge;
  20. }

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