get a date from age in javascript

Question

I'm trying to show the date of birth when the user puts their age, date and month will be current, for this example 12 here present age

     var d = new Date();
     var newdate = (d.getFullYear()-12)+'-'+(d.getMonth()+1)+'-'+d.getDate();
     document.getElementById("age").value =newdate;

if I put the static values it shows on the HTML field (age)

document.getElementById("age").value ="2022-04-09";

but also if I try to change the input type from date to text then it shows the value

`let d = new Date(); d.setFullYear(d.getFullYear() - age); console.log(d.toLocaleDateString('en-CA'));` — RobG, Apr 09 '22 at 21:40

oDarkThirty · Accepted Answer · 2022-04-09T17:23:59.377

0

Changing this as I miss understood the question, what you want to do is get the date from age.

Basic HTML Setup

<input id="age" type="text">
<input type="button" onClick="javascript:yearCalculate()" value="Calculate Birth Date">
<p>
You were born on: <span id="birthDate"></span>
</p>

And your javascript code

function yearCalculate() {
    // set Birthday and get todays date
  const birthDay = new Date();
  
  // get age 
  const ageYear = document.getElementById('age').value;

    // update year
  birthDay.setFullYear(birthDay.getFullYear() - ageYear);
  
  document.getElementById('birthDate').innerHTML = birthDay;
}

JSFiddle: https://jsfiddle.net/Lfrad2t6/

edited Apr 09 '22 at 17:23

answered Apr 09 '22 at 16:40

oDarkThirty

40
5

what I want is to display date from age – Salum Said Apr 09 '22 at 16:44
Please check now I updated it, miss understood from first question – oDarkThirty Apr 09 '22 at 17:24
@SalumSaid would be great if my answer helped you that you choose it as the solution, this helps with reputation https://stackoverflow.com/help/whats-reputation – oDarkThirty Apr 24 '22 at 15:38

get a date from age in javascript

1 Answers1