<label for="year">Year</label>
<input type="text" id="year" />
<label for="month">Month</label>
<input type="text" id="month" />
<label for="day">Day</label>
<input type="text" id="day" /><br /><br />
<input type="button" value="calc date" onclick="calc()" /><br /><br />
<label for=" result">Result</label>
<input type="text" id="result" />
<label for=" resultiso">Result ISO</label>
<input type="text" id="resultiso" />
function calc() {
var y = document.getElementById('year').value;
var m = document.getElementById('month').value;
var d = document.getElementById('day').value;
var result = new Date(y, m, d);
document.getElementById('result').value = result;
document.getElementById('resultiso').value = result.toISOString();
}
نتیجه رو اینجا ببینین:
https://jsfiddle.net/mazoolagh/52a3fLh9/23/