To alert the timezone for Paris in JavaScript, you can use the Intl.DateTimeFormat() constructor along with the resolvedOptions() method to access the timezone information. Here's an example code snippet:

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const parisTimezone = Intl.DateTimeFormat('en-US', { timeZone: 'Europe/Paris' }).resolvedOptions().timeZone;
alert(parisTimezone);

This code will display a pop-up dialog box with the timezone information for Paris.

Note that the timeZone option passed to Intl.DateTimeFormat() should be set to the IANA time zone identifier of your desired location. In this case, we've used 'Europe/Paris' to specify Paris time. You can find a complete list of time zone identifiers here: https://en.wikipedia.org/wiki/List_of_tz_database_time_zones

Sure, to show date and time in a specific timezone, you can use the following steps:

Step 1: Define the timezone to be used You need to define which timezone you want to use in the JavaScript function. You can do this by creating a new Date object with the getTimezoneOffset() method. The getTimezoneOffset() method returns the difference between Universal Coordinated Time (UTC) and the current time zone, in minutes.

Step 2: Adjust the timezone offset Next, you need to adjust this offset by adding or subtracting the required number of minutes to the current date and time.

Step 3: Display the date and time Finally, you can use the toLocaleString() method to display the date and time in the desired format.

Here's an example code block to get you started:

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// set the date to show in PST timezone
let date = new Date();
let timezoneOffset = date.getTimezoneOffset();
let pstOffset = -480; // this is the offset for the Pacific Standard Time timezone
let adjustedTime = new Date(date.getTime() + (pstOffset + timezoneOffset) * 60 * 1000);

// display the date and time in PST timezone
let options = {
  day: 'numeric',
  month: 'numeric',
  year: 'numeric',
  hour: 'numeric',
  minute: 'numeric',
  second: 'numeric',
  timeZone: 'America/Los_Angeles'
};
let pstDateTime = adjustedTime.toLocaleString('en-US', options);
console.log(pstDateTime); // Output: 2/16/2022, 11:01:20 AM

Note that to set the timezone, you need to specify a timezone name that is valid in the IANA Time Zone database, such as America/Los_Angeles for Pacific Standard Time (PST). You can find a list of valid timezone names at https://en.wikipedia.org/wiki/List_of_tz_database_time_zones.

Using the JavaScript Date Object you can use the getTimezoneOffset() method to show the current time in a searched city. Here is an example:

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let city = 'New York'
let currentTime = new Date()
let timeZoneOffset = currentTime.getTimezoneOffset() 
let offsetHours = timeZoneOffset / 60
let adjustedTime = new Date(currentTime.getTime() + offsetHours * 3600 * 1000) 
console.log(`The time in ${city} is ${adjustedTime.getHours()}h ${adjustedTime.getMinutes()}min`)

This code will log out the current time in the searched city (in this case New York).

You can get the current time of other cities in Javascript by using the Date.prototype.toLocaleString method.

This method takes an optional options parameter, which includes a timeZone option. This timeZone option receives a string in the format of "Area/Location" and it automatically converts the date to the timezone of the given location. For example:

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var currentTime = new Date().toLocaleString({timeZone: 'America/New_York'});
console.log(currentTime); // Displays the current time of New York City