How to calculte a person's age in C#.net

Question

2.00/5 (4 votes)

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C#

I want to write a code to calculate a person's age by taking birthdate from the user. Using datetime function.

Posted 6-Apr-11 19:56pm

rinks25

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Comments

Abhinav S 7-Apr-11 13:32pm

What have you tried so far?

6 solutions

Solution 3

Using the Time Period Library[^]:

// ----------------------------------------------------------------------
public void AgeSample( DateTime birthDay )
{
  // output: x Year x Months
  Console.WriteLine( new DateDiff( birthDay ).GetDescription( 2 ) );
} // AgeSample

Posted 7-Apr-11 7:15am

Jani Giannoudis

Solution 4

C#

Console.WriteLine("How old are you? (Please speak clearly into your monitor)");

Posted 7-Apr-11 7:23am

#realJSOP

v2

Comments

Andreas Gieriet 20-Feb-13 12:09pm

My 5!
Does not directly help, but I like it :-)
An alternative is: "Please enter your age" to get the age. ;-)
Seriously, sometimes, one forgets considering the obviously simplest solution!
Cheers
Andi

Solution 5

Now that I've given everyone a chance to stop laughing...

C#

int age = DateTime.Now.Year - birthday.Year;

Posted 7-Apr-11 10:02am

#realJSOP

Comments

Michael Bookatz 7-Apr-11 18:49pm

Hi John,

Not sure this will work as what happens if it's Jan and the birthday is in Dec? You will make him 11 months older then he is.

Regards

#realJSOP 8-Apr-11 8:58am

You have my permission to make any adjustments that you see fit, including doing the timespan calculation and get the days and divide by 365.

Jani Giannoudis 8-Apr-11 12:02pm

see solution 4 ;)

Solution 7

C#

DateTime dob = DateTime.Parse("11 Dec 1992");
DateTime curYear = DateTime.Now.Year;
TimeSpan ts = CurYear - dob;
Sting age = ts.ToString() + "Years" ;

Posted 20-Feb-13 5:57am

Surendra0x2

Comments

SoMad 20-Feb-13 12:45pm

I think you should run a calculation on the age of this question. I don't think it was necessary to resurrect it after all this time.

Soren Madsen

Shrikesh_kale 7-Mar-15 0:45am

any one help me for age calculate As year , month, day

Surendra0x2 11-Mar-15 8:15am

https://raasukutty.wordpress.com/2009/06/18/c-calculate-age-in-years-month-and-days/
https://gist.github.com/faisalman/1724253

refer these links...

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-04-06T20:02:00

Solution 2

Hm. How come the MSDN help did not tell you that? It looks so obvious:

C#

System.DateTime birthTime = AskTheUser(myUser); // :-)
System.DateTime now = System.DateTime.Now;
System.TimeSpan age = now - birthTime; //as simple as that
double ageInDays = age.TotalDays; // will you convert to whatever you want yourself?

—SA

Posted 6-Apr-11 20:02pm

Sergey Alexandrovich Kryukov

Updated 6-Apr-11 22:19pm

v2

Comments

HaBiX 7-Apr-11 3:45am

3.70 / 5, 6 votes Vote

lot of users dont see the benefit of timespan -_-"
5 from me

Sergey Alexandrovich Kryukov 7-Apr-11 4:18am

It's great I found one who does. :-) Thank you very much.
--SA

CPallini 7-Apr-11 4:21am

My 5.

Sergey Alexandrovich Kryukov 7-Apr-11 4:23am

Decided to join the club? :-) (I refer to the comments above.)
You're very welcome. And thank you.
--SA

CPallini 7-Apr-11 4:29am

Well, people don't realize time and time-interval are different types.

Sergey Alexandrovich Kryukov 7-Apr-11 4:56am

Right. And also people do not realize that date and time are not different things.
Calling a type DateTime is almost the same as to call it YearTime or MonthTime. There is just Time and Duration; the difference is essential.
--SA

Nuri Ismail 7-Apr-11 4:37am

Good answer. My 5. :)

Sergey Alexandrovich Kryukov 7-Apr-11 4:53am

Wow, and you want to join the club, too! :-)
You're very welcome. And thanks.
--SA

Menon Santosh 8-Sep-12 4:54am

nice Solution +5

Sergey Alexandrovich Kryukov 8-Sep-12 6:19am

Thank you, Menon.
--SA

Andreas Gieriet 20-Feb-13 12:06pm

My 5!
Andi

Sergey Alexandrovich Kryukov 20-Feb-13 14:10pm

Thank you, Andi.
—SA

**JF2015** · Accepted Answer · 2011-04-06T20:01:00

Solution 1

DateTime birthdate = new DateTime(1981, 1, 7);
DateTime now = DateTime.Now;
int years = now.Year - birthdate.Year;
if (now.Month < birthdate.Month || (now.Month == birthdate.Month && now.Day < birthdate.Day))
  years--;
MessageBox.Show(years.ToString());

Posted 6-Apr-11 20:01pm

JF2015

Updated 6-Apr-11 20:03pm

v2

Comments

Sergey Alexandrovich Kryukov 7-Apr-11 2:04am

Well, do you think integer number of years is required? :-) Good. My 5.
I answered, too.
--SA

Nuri Ismail 7-Apr-11 4:41am

Personally I'd use TimeSpan (already suggested by SA)
but your answer is also good. My 5. :)