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The getUTCDay() method in JavaScript is a part of the Date object and is used to get the day of the week (0-6) for a given date object, in the UTC time zone. This can be useful for getting the day of the week in a specific time zone, or for working with dates in a consistent time zone.

Here’s an example of how to use getUTCDay() to get the current day of the week in UTC time:

let date = new Date();
let day = date.getUTCDay();
console.log(day);  // Outputs the current day of the week in UTC time (0-6)

You can also pass a date object as an argument to getUTCDay() to get the day of the week for a specific date in UTC time:

let date = new Date(2022, 0, 1, 11, 30, 0);  // January 1, 2022 at 11:30:00 (local time)
let day = date.getUTCDay();
console.log(day);  // Outputs 6

Note that the getUTCDay() method returns the day of the week as a number, with 0 representing Sunday, 1 representing Monday, and so on. If you want to get the day of the week as a name, you can use an array of day names and access the appropriate element based on the day number returned by getUTCDay().

Here’s an example of how to get the day of the week name for a specific date in UTC time:

let date = new Date(2022, 0, 1, 11, 30, 0);  // January 1, 2022 at 11:30:00 (local time)
let dayNames = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
let day = date.getUTCDay();
console.log(dayNames[day]);  // Outputs "Saturday"

In addition to getting the day of the week, you can also use the setUTCDay() method to set the day of the week for a date object in UTC time. However, this method is not widely supported and may not work in all browsers.