internationalization - Get UTC + 1 time with javascript - Stack Overflow

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var options = { timeZone: 'UTC', timeZoneName: 'short'};
const today = new Date();
$w("#pikoTimer").text = today.toLocaleTimeString("en-GB", options);

This is my code i want to use, so when I click a button it sets the text to UTC time - with UTC it works fine but I want to set it to UTC + 1 and I cant find a solution.

When i try timeZone: 'UTC+1' it gives me an error saying: RangeError: Invalid time zone specified: UTC+1

var options = { timeZone: 'UTC', timeZoneName: 'short'};
const today = new Date();
$w("#pikoTimer").text = today.toLocaleTimeString("en-GB", options);

This is my code i want to use, so when I click a button it sets the text to UTC time - with UTC it works fine but I want to set it to UTC + 1 and I cant find a solution.

When i try timeZone: 'UTC+1' it gives me an error saying: RangeError: Invalid time zone specified: UTC+1

• javascript
• internationalization
• datetime-format

Share Improve this question Follow edited Aug 31, 2020 at 11:47 Eric Redon 1,7621212 silver badges2121 bronze badges asked Aug 31, 2020 at 9:06 Dominik LembergerDominik Lemberger 2,44622 gold badges2525 silver badges3434 bronze badges

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2 Answers 2

Sorted by: Reset to default 4

The ECMAScript Language Specification stipulates (ECMA-262 section 20.4.4.40) that the options parameter of the Date.prototype.toLocaleTimeString() function is to be implemented as specified in ECMA-402 (the ECMAScript Internationalization API Specification).

According to ECMA-402, the timeZone option is valid if it conforms to section 6.4 (“Time Zone Names”), which stipulates:

The ECMAScript […] Internationalization API Specification identifies time zones using the Zone and Link names of the IANA Time Zone Database. Their canonical form is the corresponding Zone name in the casing used in the IANA Time Zone Database.

Which is why your code works when using UTC (which is a link to Etc/UTC in the IANA Time Zone Database), but you get an error when using UTC+1 (which is not a valid IANA Time Zone).

Instead, you should use a value that represents the same UTC+01:00 offset, and observes desired daylight time adjustments. For example, you may use Europe/Paris or Europe/Belgrade.

const options = { timeZone: 'Europe/Paris', timeZoneName: 'short'};
const today = new Date();
$w("#pikoTimer").text = today.toLocaleTimeString("en-GB", options);

See List of tz database time zones for a handy online reference.

you should specify time zone name in option's timeZone field like timeZone: 'Australia/Sydney' or timeZone: 'EST'; and utc+1 is a invalid time zone name. read more in mdn Intl/DateTimeFormat; you can use a city name with the time zone you want like this:

const options = { timeZone: 'Europe/London', timeZoneName: 'short'};
const today = new Date();
console.log(today.toLocaleTimeString("en-GB", options))

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