age should be calculated based on date of birth in asp.net?

Question

I m new in asp.net

I want when user select date of birth then automatically calculate their age and fill up the age text box and I performing one logic but somewhere My logic is wrong?

code:

default.aspx

<form>
            <label for="date"><b>Date Of Birth:</b></label>
            <asp:Calendar  ID="txtdate" placeholder="Select Your Date Of Birth" runat="server" OnSelectionChanged="txtdate_SelectionChanged"></asp:Calendar>


            <label for="age"><b>Age:</b></label>
            <asp:TextBox ID="txtage" runat="server" placeholder="Age"></asp:TextBox>
</form>

default.aspx.cs

        protected void txtdate_SelectionChanged(object sender, EventArgs e)
        {
            DateTime birthdate=txtdate.SelectedDate.Date;  //select date from calender

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

            txtage.Text = age.ToString();
        }

        protected void age_TextChanged(object sender, EventArgs e)
        {

        }

when I select the date of birth from calender(1/12/2017) In the watch window then display the 3 year but I want to display 2 years 4 months 24 days

watch window:

which place I need to change my logic?

Talk us through what you think `int age = DateTime.Now.Year - birthdate.Year;` does? — mjwills, Apr 25 '20 at 09:28
@mjwills which place change the code? because int, float give the whole number — rahul_patil, Apr 25 '20 at 09:34
https://forums.asp.net/t/1289294.aspx?TimeSpan+Years+and+Months — Stefan, Apr 25 '20 at 09:34
This questuion is already answered here: https://stackoverflow.com/questions/38215171/calculate-year-month-and-day-between-two-dates-in-c-sharp — Ihor Konovalenko, Apr 25 '20 at 10:10

score 1 · Answer 1 · answered Apr 25 '20 at 09:44

1

Try this one:

var age = DateTime.Now - birthdate;

Instead of:

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

answered Apr 25 '20 at 09:44

Yojizan

136
3

when I select 28/12/2018 then display the age this type 575.15:20:13.7173816 – rahul_patil Apr 25 '20 at 09:53
here I m missing something ```txtage.Text = age.ToString();``` I m writing the tostring that is the reason the date is not properly shown? what can I do here – rahul_patil Apr 25 '20 at 09:56

David Khachatryan · Answer 2 · 2020-04-25T10:27:54.723

1

    DateTime Birth = txtdate.SelectedDate.Date;
    DateTime Today = DateTime.Now;


    TimeSpan Span = Today - Birth;


    DateTime Age = DateTime.MinValue + Span;


    // 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;
    txtage.Text = Years.ToString() + " Years, " + Months.ToString() + " Months, " + Days.ToString() + " Days";

edited Apr 25 '20 at 10:27

answered Apr 25 '20 at 09:56

David Khachatryan

41
4

can u change this line ```DateTime Birth = txtdate.SelectedDate.Date;``` accordingly your code is working fine – rahul_patil Apr 25 '20 at 10:23
and one thing I notice many online age calculators is displaying the wrong date that is the reason testing for multi-time – rahul_patil Apr 25 '20 at 10:31

age should be calculated based on date of birth in asp.net?

2 Answers2