I'm stuck on this activity of mine where we need to subtract the inputs of two dates: It keeps saying "Uncaught TypeError: Cannot read properties of null (reading 'value')" and I'm using CodePen.io as the IDE
HTML:
From Date:
<input id="start" name="trip-start">
<p>
To Date:
<input id="end" name="trip-end"><p>
<button id="Subtract" onclick="document.getElementById('demo').innerText =
subtract(document.getElementById('Difference_In_Days').value)" > Show Me Difference </button>
<p>
<input id="demo">
JScript:
function subtract(txt)
{
var date1 = txt.match(/^\d?\d\/(\d?\d)\/\d{4}$/);
return date1? !!Date.parse(txt) && new Date(txt).getDate()==date1[1] : false;
var date2 = txt.match(/^\d?\d\/(\d?\d)\/\d{4}$/);
return date2? !!Date.parse(txt) && new Date(txt).getDate()==date2[1] : false;
var Difference_In_Time = date2.getTime() - date1.getTime();
var Difference_In_Days = String(Difference_In_Time());
}
const oneDay = 24 * 60 * 60 * 1000; // hours*minutes*seconds*milliseconds
const firstDate = new Date(2008, 1, 12);
const secondDate = new Date(2008, 1, 22);
const diffDays = Math.round(Math.abs((firstDate - secondDate) / oneDay));
console.log(diffDays)The question is already answered in
How do I get the number of days between two dates in JavaScript?
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