Question 72382 in Javascript Question posted in
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Why is JS function "toLocaleString" substracting hours? – Javascript

I am currently coding a web app in React that fetches data from an API. I am trying to display the timestamp data in a user-friendly format by converting it to a new date using the toLocaleString function.

I notice that there is a two-hour difference between the timestamp and the displayed time. Sometimes, there is only a one-hour difference.

but look what happens when I console.log this:

console.log(new Date(tData).toLocaleString("fr-FR") + " --- " + tData)

26/04/2023 14:22:22 --- 2023-04-26T12:22:22.985+00:00
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2

Answers


  1. Chosen as BEST ANSWER
    0

    Because of time zones, (+00:00) at the end means that it is in the UTC timezone.


  2. 0

    It seems like there’s a time zone issue in your code. The timestamp tData you receive from the API appears to be in UTC (Coordinated Universal Time), as indicated by the "+00:00" at the end. However, when you use toLocaleString("fr-FR"), it converts the timestamp to the local time of the specified locale (in this case, France), which is likely in a different time zone.

    To solve this issue, you can convert the UTC timestamp to the desired time zone before using toLocaleString. Here’s an example of how you can do this:

    // Your timestamp data
const tData = "2023-04-26T12:22:22.985+00:00";

// Create a Date object from the timestamp
const date = new Date(tData);

// Get the time zone offset (in minutes) for the desired locale
const timeZoneOffset = new Date().getTimezoneOffset();

// Calculate the local time in the desired locale by adding the time zone offset
const localDate = new Date(date.getTime() - timeZoneOffset * 60 * 1000);

// Format the local date using the toLocaleString function
const formattedDate = localDate.toLocaleString("fr-FR");

console.log(formattedDate + " --- " + tData);

    This code will convert the UTC timestamp to the local time of the device running the code, and then display it in the "fr-FR" locale format.

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