HTML5 Input datetime-local default value of today and current time

Question

Is there anyway that I can make a default value of HTML5 input type='datetime-local' to today's date and this current time.

Thanks before

Answer 1

It's possible. By using a JQuery function, you can have a really complete solution.

Here is an example.

JSFiddle http://jsfiddle.net/v8MNx/1/

HTML

<form action="demo.html" id="myForm">
    <p>
        <label>Date:</label>
        <input type="datetime" name="anniversaire" id="anniversaire"/>
    </p>
    <input type="submit" value="Submit"/>
</form>

JQuery:

//Function found here: https://gist.github.com/ryanburnette/8803238
$.fn.setNow = function (onlyBlank) {
  var now = new Date($.now())
    , year
    , month
    , date
    , hours
    , minutes
    , seconds
    , formattedDateTime
    ;

  year = now.getFullYear();
  month = now.getMonth().toString().length === 1 ? '0' + (now.getMonth() + 1).toString() : now.getMonth() + 1;
  date = now.getDate().toString().length === 1 ? '0' + (now.getDate()).toString() : now.getDate();
  hours = now.getHours().toString().length === 1 ? '0' + now.getHours().toString() : now.getHours();
  minutes = now.getMinutes().toString().length === 1 ? '0' + now.getMinutes().toString() : now.getMinutes();
  seconds = now.getSeconds().toString().length === 1 ? '0' + now.getSeconds().toString() : now.getSeconds();

  formattedDateTime = year + '-' + month + '-' + date + 'T' + hours + ':' + minutes + ':' + seconds;

  if ( onlyBlank === true && $(this).val() ) {
    return this;
  }

  $(this).val(formattedDateTime);

  return this;
}

$(function () {
    // Handler for .ready() called.
    $('input[type="datetime"]').setNow();

});

Answer 2

You can make it shorter:

<input type="datetime-local" id="cal">

window.addEventListener('load', () => {
  const now = new Date();
  now.setMinutes(now.getMinutes() - now.getTimezoneOffset());
  document.getElementById('cal').value = now.toISOString().slice(0, -1);
});

Answer 3

The accepted answer seems pretty complicated to me... here a shorter solution that doesn't need jQuery

JSFiddle: https://jsfiddle.net/rzaceg8v/

window.addEventListener("load", function() {
    var now = new Date();
    var utcString = now.toISOString().substring(0,19);
    var year = now.getFullYear();
    var month = now.getMonth() + 1;
    var day = now.getDate();
    var hour = now.getHours();
    var minute = now.getMinutes();
    var second = now.getSeconds();
    var localDatetime = year + "-" +
                      (month < 10 ? "0" + month.toString() : month) + "-" +
                      (day < 10 ? "0" + day.toString() : day) + "T" +
                      (hour < 10 ? "0" + hour.toString() : hour) + ":" +
                      (minute < 10 ? "0" + minute.toString() : minute) +
                      utcString.substring(16,19);
    var datetimeField = document.getElementById("myDatetimeField");
    datetimeField.value = localDatetime;
});

<input type="datetime-local" id="myDatetimeField"/>

Answer 4

The methods above worked but were too verbose for me. Here's my version:

window.addEventListener("load", function() {
    var now = new Date();
    var offset = now.getTimezoneOffset() * 60000;
    var adjustedDate = new Date(now.getTime() - offset);
    var formattedDate = adjustedDate.toISOString().substring(0,16); // For minute precision
    var datetimeField = document.getElementById("myDatetimeField");
    datetimeField.value = formattedDate;
});

Answer 5

This worked perfectly!

One note, I tried this the only month it would break, October. It would give me a '010', instead of 10.

month = (now.getMonth() +1 ).toString().length === 1 ? '0' + (now.getMonth() + 1).toString() : now.getMonth() + 1;

Answer 6

Big line works for me, if it doesn't for you you can introduce whitespaces and line breaks in the expressions.

    function setDatetimeInput(element, t = new Date()){
        function p(number){return number.toString().padStart(2, '0');}//number to 2 digit, 0 padded string
        element.value = `${t.getFullYear()}-${p(t.getMonth()+1)}-${p(t.getDate())}T${p(t.getHours())}:${p(t.getMinutes())}`;
    }

Answer 7

here's a simple way:

<input type="datetime-local" id="cal">

const currentDateTime = () => {
  var tzoffset = new Date().getTimezoneOffset() * 60000; //offset in milliseconds
  var localISOString = new Date(Date.now() - tzoffset)
    .toISOString()
    .slice(0, -1);

  // convert to YYYY-MM-DDTHH:MM
  const datetimeInputString = localISOString.substring(
    0,
    ((localISOString.indexOf("T") | 0) + 6) | 0
  );
  console.log(datetimeInputString);
  return datetimeInputString;
};

document.getElementById('cal').value = currentDateTime();