validating date for age

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hello friends.
i have a text button in asp.net page , user will enter date in it. now i want that on the basis of date enter by user we will calculate his or her age ,
and if age is 18 or more then 18 years ,only in that situation it will allow user otherwiseit will show msg 'invalid date'
thanks in advance

Posted 11-Apr-11 20:42pm

pawanvats

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3 solutions

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Pong D. Panda · Answer 1 · 2011-04-11T21:09:00

Solution 3

You can either do the validation on your Button PostBack or create a CustomValidator to access the codebelow.

public bool IsLegalAge(string inputDate) 
{
            var bday = Convert.ToDateTime(inputDate);
            var ts = DateTime.Today - bday;
            var year = DateTime.MinValue.Add(ts).Year - 1;
            return year >= 18;
}

Good luck!

Posted 11-Apr-11 21:09pm

Pong D. Panda

Comments

Pong D. Panda 12-Apr-11 4:09am

Alright! My very first contribution to CP after 4 years of lurking!

Ankur^\m/ 12-Apr-11 4:10am

You can either do the validation on your Button PostBack or create a CustomValidator to access the codebelow.
onclientclick is the right event. Returning false will not post the page and an alert can be shown saying the age is invalid.
Also a server side check should be there to ensure if JavaScript is disabled.

Anyways my 5!

Abhinav S · Answer 2 · 2011-04-11T20:47:00

Solution 1

Different ways to do this discussed here.

Posted 11-Apr-11 20:47pm

Abhinav S

Mahendra.p25 · Answer 3 · 2011-04-11T21:02:00

try this

//In Page Load Or button click  whereever you want 

-------------------------------------------------------------
int k = CalculateAge(Convert.ToDateTime("10/25/1982"));

if (k>=18)
{
  //Valid
}

else
{
 //Invalid
}

-----------------------------------------------------------------  
  
//Function to return Date


 public static int CalculateAge(DateTime birthdate)
        {
            // get the difference in years
            int years = DateTime.Now.Year - birthdate.Year;
            // subtract another year if we're before the
            // birth day in the current year
            if (DateTime.Now.Month < birthdate.Month || (DateTime.Now.Month == birthdate.Month && DateTime.Now.Day < birthdate.Day))
                years--;
            return years;
        }

//Via Javascript

<script type="text/javascript">
        function age() {
            alert("Hii");
    var birthDay = document.getElementById("TextBox1");
 var now = new Date()
 var b_split = birthDay.value.split('/');
 if(b_split.length==3){
   var birthDate = new Date(b_split[2], b_split[1]*1-1, b_split

[0]);
   var years = Math.floor((now.getTime() - birthDate.getTime()) / (365.25 * 24 * 60 * 60 * 1000));
   if (years >= 18) {
       
//Your Condition
   }
   else {
//Your Condition

      
   }
 }
}
</script>


 //On Button
 <asp:Button ID="Button1" runat="server" Text="Button"  OnClientClick="javascript:return age();"  />