calculate age of a person

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C#

How to calculate age of a person in c# in window application ?

Posted 15-Mar-12 0:11am

Janardan Pandey

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Rahul Rajat Singh · Answer 1 · 2012-03-15T00:15:00

take the user input for date of birth.
store this in datetime object.
get the current date from the system or from network.
store this in datetime object.

use simple arithmetic on datetime.year/month/day to calculate the age.

use calender control to make sure user entered date is in correct format.

sravani.v · Answer 2 · 2012-03-15T00:18:00

Solution 2

Refer these:

http://snippets.dzone.com/posts/show/1632[^]

http://stackoverflow.com/questions/9/how-do-i-calculate-someones-age-in-c[^]

Posted 15-Mar-12 0:18am

sravani.v

Updated 15-Mar-12 0:19am

v2

Mike Hankey · Answer 3 · 2012-03-15T00:18:00

Solution 3

One way would be to use the DateTime class this[^] might be useful.

Posted 15-Mar-12 0:18am

Mike Hankey

OriginalGriff · Answer 4 · 2012-03-15T00:20:00

Solution 4

Try:

C#

DateTime bornOn = new DateTime(1999, 7, 21);
TimeSpan diff = DateTime.Now - bornOn;
DateTime age =  DateTime.MinValue + diff;
Console.WriteLine(age.Year - 1);

Posted 15-Mar-12 0:20am

OriginalGriff

Jani Giannoudis · Answer 5 · 2012-03-15T09:51:00

The following approach (extract from Time Period Library for .NET[^] class DateDiff) considers the calendar of the culture info:

C#

// ----------------------------------------------------------------------
private static int YearDiff( DateTime date1, DateTime date2 )
{
  return YearDiff( date1, date2, DateTimeFormatInfo.CurrentInfo.Calendar );
} // YearDiff

// ----------------------------------------------------------------------
private static int YearDiff( DateTime date1, DateTime date2, Calendar calendar )
{
  if ( date1.Equals( date2 ) )
  {
    return 0;
  }

  int year1 = calendar.GetYear( date1 );
  int month1 = calendar.GetMonth( date1 );
  int year2 = calendar.GetYear( date2 );
  int month2 = calendar.GetMonth( date2 );

  // find the the day to compare
  int compareDay = date2.Day;
  int compareDaysPerMonth = calendar.GetDaysInMonth( year1, month1 );
  if ( compareDay > compareDaysPerMonth )
  {
    compareDay = compareDaysPerMonth;
  }

  // build the compare date
  DateTime compareDate = new DateTime( year1, month2, compareDay,
    date2.Hour, date2.Minute, date2.Second, date2.Millisecond );
  if ( date2 > date1 )
  {
    if ( compareDate < date1 )
    {
      compareDate = compareDate.AddYears( 1 );
    }
  }
  else
  {
    if ( compareDate > date1 )
    {
      compareDate = compareDate.AddYears( -1 );
    }
  }
  return year2 - calendar.GetYear( compareDate );
} // YearDiff

And that's the usage:

C#

// ----------------------------------------------------------------------
public void CalculateAgeSamples()
{
  PrintAge( new DateTime( 2000, 02, 29 ), new DateTime( 2009, 02, 28 ) );
  // > Birthdate=29.02.2000, Age at 28.02.2009 is 8 years
  PrintAge( new DateTime( 2000, 02, 29 ), new DateTime( 2012, 02, 28 ) );
  // > Birthdate=29.02.2000, Age at 28.02.2012 is 11 years
} // CalculateAgeSamples

// ----------------------------------------------------------------------
public void PrintAge( DateTime birthDate, DateTime moment )
{
  Console.WriteLine( "Birthdate={0:d}, Age at {1:d} is {2} years",
    birthDate, moment, YearDiff( birthDate, moment ) );
} // PrintAge