GET AGE IN YEARS,MONTHS,DAYS,HOURS AND SECONDS FROM DOB IN ASP.NET C#

ntroduction : Through this article you will learn the following:

• How to get/calculate age in years, months, days, hours and seconds from Date of Birth or we can say any date in asp.net.
• How to validate date using RegularExpression validation control.
• How to implement Ajax CalendarExtendar control for selecting DOB or Date.
• How to set the Start date and End Date in the Ajax CalendarExtendar control .

Click on image to enlarge

In previous articles i explained How to Convert Rupees,Currency or Numbers to Words in Asp.net C# and How to Fill Country,State,Cities in the DropDownList in asp.net C#,VB.Net and How to create and consume WCF Services in asp.net ? and Bind,Save,Edit,Update,Cancel,Delete,Paging example in GridView and WCF Service to bind,insert,edit,update,delete from sql server database in asp.net and How to create crystal reports in visual studio 2010 using asp.net .

Implememetation: Now let's create an asp.net website to understand. Place a ScriptManager control, two TextBox and Button control from the Visual studio toolkit.

Also place CalendarExtendar control from the AjaxControlToolKit if you have already installed the AjaxControlToolkit.

If not then you can follow the instructions to install the AjaxControlToolkit from my previous article.

• In the design page (.aspx) design the page as:

<fieldset  style="width:440px;">

    <legend>Get age in years,months,days,hours and seconds from DOB in asp.net</legend>

        <asp:ScriptManager ID="ScriptManager1" runat="server">

        </asp:ScriptManager>

    <table>

    <tr>

    <td>DOB: </td><td>

        <asp:TextBox ID="txtDOB" runat="server"></asp:TextBox>

        <asp:CalendarExtender ID="CalendarExtender1"

         PopupButtonID="txtDOB"

        PopupPosition="Right"

         TargetControlID="txtDOB"

          Format="dd/MM/yyyy"

          StartDate="01/01/1900"

           runat="server">

        </asp:CalendarExtender>

        <asp:Button ID="btnGetAge" runat="server" Text="Get Age"

            onclick="btnGetAge_Click" />

        <asp:RequiredFieldValidator ID="rfvDOB" runat="server"

            ErrorMessage="Please select Date of Birth" ControlToValidate="txtDOB"

            Display="Dynamic" ForeColor="Red" SetFocusOnError="True"></asp:RequiredFieldValidator>

        <asp:RegularExpressionValidator ID="rgeDob" runat="server"

            ControlToValidate="txtDOB" ErrorMessage="Please enter dob in dd/mm/yyyy format"

            SetFocusOnError="True"            

            ValidationExpression="^(((0[1-9]|[12]\d|3[01])/(0[13578]|1[02])/((19|[2-9]\d)\d{2}))|((0[1-9]|[12]\d|30)/(0[13456789]|1[012])/((19|[2-9]\d)\d{2}))|((0[1-9]|1\d|2[0-8])/02/((19|[2-9]\d)\d{2}))|(29/02/((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$"

            Display="Dynamic" ForeColor="Red"></asp:RegularExpressionValidator>

        </td>

    </tr>

    <tr>

    <td></td><td>

        <asp:TextBox ID="txtCalculatedAge" runat="server" TextMode="MultiLine"

            Height="39px" Width="353px" Rows="3"></asp:TextBox>

        </td>

    </tr>

    </table>

    </fieldset>

• Have you noticed the line<%@RegisterAssembly="AjaxControlToolkit"Namespace="AjaxControlToolkit"TagPrefix="asp"%> added automatically next to the very first line in the design page. Actually it registers the Ajax Controlon placing CalendarExtendar control on design page.

C#.Net Code to get age years,months,days,hours and seconds from DOB in asp.net 

• In the code behind file (.aspx.cs) write the code as:

protected void Page_Load(object sender, EventArgs e)

    {

        if (!Page.IsPostBack)

        {

            CalendarExtender1.EndDate = System.DateTime.Now;

        }       

    }

    private string CalculateAge(DateTime Dob)

    {

        DateTime Now = DateTime.Now;

        int Years = new DateTime(DateTime.Now.Subtract(Dob).Ticks).Year - 1;

        DateTime PastYearDate = Dob.AddYears(Years);

        int Months = 0;

        for (int i = 1; i <= 12; i++)

        {

            if (PastYearDate.AddMonths(i) == Now)

            {

                Months = i;

                break;

            }

            else if (PastYearDate.AddMonths(i) >= Now)

            {

                Months = i - 1;

                break;

            }

        }

        int Days = Now.Subtract(PastYearDate.AddMonths(Months)).Days;

        int Hours = Now.Subtract(PastYearDate).Hours;

        int Minutes = Now.Subtract(PastYearDate).Minutes;

        int Seconds = Now.Subtract(PastYearDate).Seconds;

        return String.Format("Age: {0} Year(s) {1} Month(s) {2} Day(s) {3} Hour(s) {4} Second(s)",

                            Years, Months, Days, Hours, Seconds);

    }

  

    protected void btnGetAge_Click(object sender, EventArgs e)

    {    

        try

        {

            string dtVal = txtDOB.Text.Trim();

            DateTime Dob = Convert.ToDateTime(dtVal);

            txtCalculatedAge.Text = CalculateAge(Dob);

        }

        catch{}

    }