Question 237110 in Javascript Question posted in
A very good W3school tutorial can be found here.

Javascript – Convert date to UTC in JS

I have input string like 2023-02-02 15:35 CET and I have to convert this into UTC time.

I’m trying to find a solution for this, but I’m not able to figure out how to convert input string into Date() object in js.

My main problem is that I cannot figure out how to create Date() with timezone. Time-zones can differ and it could be anything like BST, HKTect.

Can somebody help how to get UTC time from input string like this?

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2

Answers


  1. 0

    to convert your date to UTC you can use the .toUTCString() method.

    var inputDate = "2023-02-02 15:35 EST";
var date = new Date(inputDate);
var dateUTC = date.toUTCString();
console.log(dateUTC);
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  2. 0

    I just translated the PHP code from the following thread https://stackoverflow.com/questions/67295211/convert-cest-cet-to-utc0 into javascript. Hope it will work for you

    function convertCESTorCET(dateTime) {
    // Create two timezone objects
    const timeZoneUTC0 = 'Atlantic/Reykjavik';
    const timeZoneCEST_CET = 'Europe/Copenhagen';

    // Create two Date objects that will contain the same Unix timestamp, but
    // have different timezones attached to them.
    const dateUTC = new Date(dateTime);
    const dateCEST_CET = new Date(dateTime);

    // Set the timezones for the Date objects
    dateUTC.setTimezone(timeZoneUTC0);
    dateCEST_CET.setTimezone(timeZoneCEST_CET);

    // Calculate the time offset for the date/time contained in the dateUTC
    // object, but using the timezone rules as defined for Denmark
    // (dateCEST_CET).
    const timeOffset = dateCEST_CET.getTimezoneOffset() * 60 * 1000; // Convert minutes to milliseconds

    // Calculate the new timestamp by subtracting the time offset
    const newTimestamp = new Date(dateUTC - timeOffset);

    // Format the new timestamp to match the "Y-m-d H:i:s" format
    const formattedDate = newTimestamp.toISOString().replace('T', ' ').substr(0, 19);

    return formattedDate;
}
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