How to calculate age in years from dob in c#

This question already has an answer here:

How do I calculate someone's age in C#? 64 answers

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You can calculate it using TimeSpan like:

DateTime dob = .....
DateTime Today = DateTime.Now;
TimeSpan ts = Today - dob;
DateTime Age = DateTime.MinValue + ts;


// note: MinValue is 1/1/1 so we have to subtract...
int Years = Age.Year - 1;
int Months = Age.Month - 1;
int Days = Age.Day - 1;

Source: http://forums.asp.net/t/1289294.aspx/1

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DateTime today = DateTime.Today;

int age = today.Year - bday.Year;

if (bday > today.AddYears(-age))
 age--;

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[Update]: To account for leap years use 365.242 instead of 365. You should be good till the year 2799 I believe.

DateTime has an operator overload, when you use the subtract operator you get a TimeSpan instance.

So you will just do:

DateTime dob = ..
TimeSpan tm = DateTime.Now - dob;
int years = ((tm.Days)/365);

Your code should ideally look like this:

private void button1_Click(object sender, EventArgs e)
{
    DateTime dob = //get this some somewhere..
    textBox1.Text = dob.ToString();
    TimeSpan tm = (DateTime.Now - dob);
    int age = (tm.Days/365) ;
}

The TimeSpan structure represents a time interval, it has properties like Days , Hours , Seconds etc so you could use them if you need.

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