You can use the setInterval() function in JavaScript to update the time in real-time. To get the current time in milliseconds and in UTC, you can use the getTime() method of the Date object and the toUTCString() method respectively.

Here's an example code:

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function updateTime() {
   let currentTime = new Date();
   let currentTimeMillis = currentTime.getTime();
   let currentUTCTime = currentTime.toUTCString();

   console.log("Current time in milliseconds: " + currentTimeMillis);
   console.log("Current time in UTC: " + currentUTCTime);
}

setInterval(updateTime, 1000); // Run updateTime() every second

In this example, the updateTime() function gets the current time in milliseconds and in UTC, and logs them to the console. The setInterval() function is used to run updateTime() every second (every 1000 milliseconds), so it gets updated in real-time.

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.

You can use the Date() object in JavaScript to retrieve the current time in any location.

Here is an example of how to use Date() to return the current time in UTC:

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const currentTime = new Date().toUTCString();
console.log(currentTime) // Returns the current time in string format