Calculate age In C#

Vijay

Please can you help me in console application.
How to calculate age from DOB

class Personal{
public DateTime DateOfBirth { get; set; }
public string Age { get; set; }
}

Personal per=new Personal();
Console.WriteLine("Enter the Date Of Birth :",per.DateOfBirth);
per.DateOfBirth = DateTime.Parse(Console.ReadLine());

public string GetAge(DateTime DateOfBirth)
{
}

How can i write for function to calculate age from DOB and display

Console.WriteLine("The DOB is" +DateOfBirth);
Console.WriteLine("the Age is ...." +Age);

DOB is 04/02/1994
i want display age is 19 years, 6 months, and 9 days

Thanks.

11 Replies

Know the answer? Post it — somebody with the same question will find it here.

Sanjeeb Lenka13y ago
Accepted answer
try this one:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace IfExample
{
    class DateTimeExtensions
    {
        public string ToAgeString( DateTime dob)
        {
            DateTime dt = DateTime.Now;

            int days = dt.Day - dob.Day;
            if (days < 0)
            {
                dt = dt.AddMonths(-1);
                days += DateTime.DaysInMonth(dt.Year, dt.Month);
            }

            int months = dt.Month - dob.Month;
            if (months < 0)
            {
                dt = dt.AddYears(-1);
                months += 12;
            }

            int years = dt.Year - dob.Year;

            return string.Format("{0} year{1}, {2} month{3} and {4} day{5}",
                                 years, (years == 1) ? "" : "s",
                                 months, (months == 1) ? "" : "s",
                                 days, (days == 1) ? "" : "s");
        }

        static void Main()
        {
            DateTimeExtensions obj = new DateTimeExtensions();
            Console.WriteLine("Enter your date of birth in dd/MM/yyyy format to calculate age");
            string strDate = DateTime.ParseExact(Console.ReadLine(), "dd/MM/yyyy", null).ToString("MM/dd/yyyy");
            DateTime dob = DateTime.Parse(strDate);
            string s = obj.ToAgeString(dob);
            Console.WriteLine(s);
            Console.ReadLine();
        }
    }
}
Hamid Khan6y ago
Please use this link for the same:

https://www.c-sharpcorner.com/code/961/how-to-calculate-age-from-date-of-birth-in-c-sharp.aspx

https://codereview.stackexchange.com/questions/44606/simple-age-calculator
Zainal Abidin10y ago
I'm Sorry I want to learn, would you like to explain how do you think or how the logical of this source code, i just newbie
Zainal Abidin10y ago
I'm Sorry I want to learn, would you like to explain how do you think or how the logical of this source code, i just newbie
B12y ago
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace Datetmes
{
class Program
{
static void Main()
{
Console.WriteLine("Enter your Date Of Birth As Year Month and Date");
String s = Console.ReadLine();
int[] dob = new int[3];
String[] a = s.Split('.');
for (int i = 0; i < 3; i++)
dob[i] = Int32.Parse(a[i]);

DateTime dt = new DateTime(dob[0],dob[1], dob[2]);

Console.WriteLine("Enter Required Date As Year Month and Date");
String t = Console.ReadLine();
int[] tod = new int[3];
String[] b = t.Split('.');
for (int j = 0; j < 3; j++)
tod[j] = Int32.Parse(b[j]);
DateTime dt1 = new DateTime(tod[0], tod[1], tod[2]);
ShowDifference(dt, dt1);
Console.WriteLine();
Console.ReadLine();
}
static void ShowDifference(DateTime start, DateTime end)
{
// if (start > end)
{
// throw new ArgumentException();
}
// See comment at the end
int years = end.Year - start.Year - 2;
while (start.AddYears(years) <= end)
{
years++;
}
years--;
//Console.WriteLine("{0} years", years);
start = start.AddYears(years);
int months = 0;
while (start.AddMonths(months) <= end)
{
months++;
}
months--;
//Console.WriteLine("{0} months", months);
start = start.AddMonths(months);
int days = 0;
while (start.AddDays(days) <= end)
{
days++;
}
days--;
//Console.WriteLine("{0} days", days);
Console.WriteLine();
//Console.WriteLine();
Console.WriteLine("Your age is: {0} Year(s) {1} Month(s) {2} Day(s) ",                                                                                 years,months,days);
}
}
}

// ABOVE CODE IS WORKING.Enter the date like this 1993.10.22
Iftikar Hussain13y ago
Hi,
Try like this

public string GetAge(DateTime DateOfBirth)
{

TimeSpan dateDiff = DateTime.Now - DateOfBirth;
DateTime age = new DateTime(dateDiff.Ticks);

int years = age.Year - 1;
int month = age.Month - 1;
int days = age.Day - 1;
string result = String.Format("{0} years {1} months {2} days", years, month, days);
return result;
}

Regards,
Iftikar
Joxin Stanly13y ago
in your existing code change DateTime DOB = new DateTime(day, month, year);
to DateTime DOB = new DateTime(year,month,day );
Sanjeeb Lenka13y ago
try this code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace IfExample
{
    class DateTimeExtensions
    {
        public string ToAgeString(DateTime dob)
        {
            DateTime dt = DateTime.Now;

            int days = dt.Day - dob.Day;
            if (days < 0)
            {
                dt = dt.AddMonths(-1);
                days += DateTime.DaysInMonth(dt.Year, dt.Month);
            }

            int months = dt.Month - dob.Month;
            if (months < 0)
            {
                dt = dt.AddYears(-1);
                months += 12;
            }

            int years = dt.Year - dob.Year;

            return string.Format("{0} year{1}, {2} month{3} and {4} day{5}",
                                 years, (years == 1) ? "" : "s",
                                 months, (months == 1) ? "" : "s",
                                 days, (days == 1) ? "" : "s");
        }

        static void Main()
        {
            DateTimeExtensions obj = new DateTimeExtensions();
            Console.Write("Enter the Birth of year : ");
            int year = int.Parse(Console.ReadLine());
            Console.Write("Enter the Birth of month : ");
            int month = int.Parse(Console.ReadLine());
            Console.Write("Enter the Birth day: ");
            int day = int.Parse(Console.ReadLine());
            string s = month + "/" + day + "/" + year;
            DateTime dob = DateTime.Parse(s);
            string s2 = obj.ToAgeString(dob);
            Console.WriteLine(s2);
            Console.ReadLine();
        }
    }
}
Vijay13y ago
Thanks Sanjeeb Lenka...

I tried like this,

Console.Write("Enter the Birth of year : ");
int year = int.Parse(Console.ReadLine());
Console.Write("Enter the Birth of month : ");
int month = int.Parse(Console.ReadLine());
Console.Write("Enter the Birth day: ");
int day= int.Parse(Console.ReadLine());

DateTime DOB = new DateTime(day, month, year);
dateOfBirth = DOB;

i cant get it...
Vijay13y ago
Hi sir,

Console.WriteLine("Enter the DOB (dd/mm/yyyy)");
DateTime dob = DateTime.Parse(Console.ReadLine());

I want to enter date is day-month-year format... for that how i want to declare
Sanjeeb Lenka13y ago
hi,

try this code

ex:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace IfExample
{
class DateTimeExtensions
{
public string ToAgeString( DateTime dob)
{
DateTime dt = DateTime.Now;

int days = dt.Day - dob.Day;
if (days < 0)
{
dt = dt.AddMonths(-1);
days += DateTime.DaysInMonth(dt.Year, dt.Month);
}

int months = dt.Month - dob.Month;
if (months < 0)
{
dt = dt.AddYears(-1);
months += 12;
}

int years = dt.Year - dob.Year;

return string.Format("{0} year{1}, {2} month{3} and {4} day{5}",
years, (years == 1) ? "" : "s",
months, (months == 1) ? "" : "s",
days, (days == 1) ? "" : "s");
}

static void Main()
{
DateTimeExtensions obj = new DateTimeExtensions();
Console.WriteLine("Enter your date of birth in mm/dd/yyyy format to calculate age");
DateTime dob = DateTime.Parse(Console.ReadLine());
string s = obj.ToAgeString(dob);
Console.WriteLine(s);
Console.ReadLine();
}
}
}