'Javascript .toLocaleString() returns wrong month?

I’m at a loss here. I need to display a JavaScript date in my locale, but the displayed locale string is off by 1 month in the future.

<!DOCTYPE html>
<html>
<body>

<p id="demo"></p>

<script>
var d = new Date(2018,4,3,21,0);
document.getElementById("demo").innerHTML = d.toLocaleString('de-DE');
</script>

</body>
</html>

The displayed result is 3.5.2018, 21:00:00 instead of 3.4.2018, 21:00:00. It works correctly if I try Date.now() instead.

Tested on both Ubuntu 14.04.5 and Linux Mint 17.3, with Firefox 59.0.2 (64-Bit) and Chromium 65.0.3325.181.

If I’m not overlooking something, I consider this a serious bug, but before filing an issue (where?) I thought I’d ask here.

Thanks for any input on this matter!

Solution 1:^[1]

Js new Date() starts counting Month from 0 to 11.
When, you are entering new Date(2018,4,3)
It's been calculated as 3-May-2018.
And, the output is 3/5/2018.

Solution 2:^[2]

The month parameter in the Date() constructor is 0-based.

You may find this helpful:

The argument month is 0-based. This means that January = 0 and December = 11. - Date - JavaScript | MDN

Solution 3:^[3]

display Date in my locale Machin and Next Months

 var d = new Date();
 d.setMonth(d.getMonth() +1);
 console.log(d.toLocaleDateString("de-DE", { month: 'long' }));
 return d.toLocaleDateString("de-DE", { month: 'long' })

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Prasanta Bose
Solution 2	D. Pardal
Solution 3	Ardalan

'Javascript .toLocaleString() returns wrong month?

Solution 1:[1]

Solution 2:[2]

Solution 3:[3]

Sources

Related Questions

Solution 1:^[1]

Solution 2:^[2]

Solution 3:^[3]