Question 190107 in Javascript Question posted in
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converting string to epoch with JavaScript

I am new to javascript
and have the following string '2023-06-19 05:00:00.554' and want to convert it to epoch i am trying something like this

var s = "2023-06-19 05:00:00.554";
var epoch = new Date(s).getTime();

console.log(epoch);

but it give wrong results any idea how to achieve this ?

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2

Answers


  1. 0

    As explained by Ricky Mo you must specify the timezone value of your date,
    otherwise the system will use the host system’s timezone at this date (with STD or DST calculation).

    2 ways

    var s = "2023-06-19T05:00:00.554+00:00"
// or
var s = "2023-06-19T05:00:00.554Z" //  Zulu time zone

    thanks to Darryl Noakes for reminding me Z (stand for "Zulu" from the ICAO) (but I remember more easily the notation with the positive + or negative - sign with the value of the time difference in ±hh:mm)

    var s = "2023-06-19T05:00:00.554+00:00";  // GMT 0 -> + 0h, 0mn
var epoch = new Date(s).getTime();

console.log(epoch); //  1687150800554 everywhere in the world!
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  2. 0

    Assuming you have string "2023-06-19 05:00:00.554" and it represents GMT, you need to first convert that to a ISO 8601 format string, so that it can be converted to a Date object reliably, regardless of the browser used. The ISO format of your input is "2023-06-19T05:00:00.554Z"

    Code using a regex to convert your input to the ISO format:

    const s = "2023-06-19 05:00:00.554";
let epoch = new Date(s.replace(/ (.*)$/, 'T$1Z')).getTime();
console.log(epoch); // output: 1687150800554
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