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JavaScript Date and Time Manipulation Quiz

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Question 1/15

Which method would you use to get the current minutes from a `Date` object?

let date = new Date();

Select your answer

`date.minutes()`

`date.getMins()`

`date.getMinutes()`

`date.getMinute()`

Question 2/15

How do you get the number of milliseconds since January 1, 1970, for a specific date object in JavaScript?

let date = new Date('2023-01-01');

Select your answer

`date.now()`

`date.getMilliseconds()`

`date.toMilliseconds()`

`date.getTime()`

Question 3/15

Which JavaScript object provides methods for internationalization and localization of date and time?

Select your answer

`DateFormatter`

`TimeZone`

`Intl.DateTimeFormat`

`DateLocale`

Question 4/15

What is the proper format for creating a specific date using the JavaScript `Date` constructor?

Select your answer

`new Date(day, month, year)`

`new Date(year, day, month)`

`new Date(year, month, day)`

`new Date(month, day, year)`

Question 5/15

If you need to manipulate time in JavaScript using libraries, which library is the most popular choice?

Select your answer

underscore.js

lodash

jQuery

moment.js

Question 6/15

How do JavaScript `Date` objects internally store date values?

Select your answer

As string representations of each date component

As objects with named properties

As the number of milliseconds since January 1, 1970 UTC

As arrays of numbers for year, month, day, etc.

Question 7/15

How would you set the minutes of a `Date` object to 45?

let date = new Date();

Select your answer

`date.minutes(45)`

`date.setMins(45)`

`date.setMinutes(45)`

`date.setMin(45)`

Question 8/15

Which method would you use to convert a JavaScript `Date` object to a string in the format: Wed Oct 08 2023?

let date = new Date('2023-10-08');

Select your answer

`date.toDateString()`

`date.format()`

`date.toString()`

`date.toLocaleDateString()`

Question 9/15

How can the `Date.UTC()` method be used in JavaScript?

Select your answer

It sets a Date object to UTC time.

It converts a Date object to a string in UTC format.

It creates a Date object in UTC but returns it as milliseconds.

It formats a Date object to UTC time.

Question 10/15

How can you get the last day of a particular month using JavaScript `Date`? (e.g., how to get the last day of February 2023)

let year = 2023;
let month = 1; // February
let date = new Date(year, month + 1, 0);

Select your answer

By setting the day to 0 of the next month

Using a hardcoded list of days per month

By checking each day's validity from day 28 up to 31

Using `date.getLastDayOfMonth()`

Question 11/15

Which of the following will return the day of the week from a JavaScript `Date` object?

let date = new Date('2023-10-08');

Select your answer

`date.day()`

`date.getDate()`

`date.getDayOfWeek()`

`date.getDay()`

Question 12/15

What is the purpose of the JavaScript `Date` object?

Select your answer

To manipulate strings

To handle Boolean values

To perform arithmetic operations

To create, manage, and format dates and times

Question 13/15

How do you get the month index from a JavaScript `Date` object (e.g., January is 0)?

let date = new Date('2023-10-08');

Select your answer

`date.getMonth()`

`date.getMonthIndex()`

`date.month()`

`date.getMonths()`

Question 14/15

How can you set the year of a JavaScript `Date` object to 2025?

let date = new Date();

Select your answer

`date.setYear(2025)`

`date.setFullYear(2025)`

`date.setDate(2025)`

`date.setMonth(2025)`

Question 15/15

What is a valid reason to use `Date.parse()` in JavaScript?

Select your answer

To convert a date string into the number of milliseconds since January 1, 1970

To format a Date object to a string

To get the current date and time

To calculate the difference between two dates

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which method would you use to get the current minutes from a `Date` object?

let date = new Date();

Available answers

`date.minutes()`

`date.getMins()`

`date.getMinutes()`

`date.getMinute()`

The `getMinutes()` method returns the minutes of a date as a number (0 to 59).

Question 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you get the number of milliseconds since January 1, 1970, for a specific date object in JavaScript?

let date = new Date('2023-01-01');

Available answers

`date.now()`

`date.getMilliseconds()`

`date.toMilliseconds()`

`date.getTime()`

The `getTime()` method returns the number of milliseconds since January 1, 1970, 00:00:00 UTC for the specified date object.

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which JavaScript object provides methods for internationalization and localization of date and time?

Available answers

`DateFormatter`

`TimeZone`

`Intl.DateTimeFormat`

`DateLocale`

The `Intl.DateTimeFormat` object is part of the ECMAScript Internationalization API and provides language-sensitive date and time formatting.

Question 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the proper format for creating a specific date using the JavaScript `Date` constructor?

Available answers

`new Date(day, month, year)`

`new Date(year, day, month)`

`new Date(year, month, day)`

`new Date(month, day, year)`

When using the `Date` constructor, the correct format is `new Date(year, month, day)`, where month starts at 0 for January.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

If you need to manipulate time in JavaScript using libraries, which library is the most popular choice?

Available answers

underscore.js

lodash

jQuery

moment.js

While many alternatives exist, `moment.js` has historically been one of the most popular libraries for date manipulation in JavaScript. However, it is in maintenance mode, and newer libraries like `date-fns` or `Luxon` are now recommended.

Question 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do JavaScript `Date` objects internally store date values?

Available answers

As string representations of each date component

As objects with named properties

As the number of milliseconds since January 1, 1970 UTC

As arrays of numbers for year, month, day, etc.

Internally, JavaScript `Date` objects store dates as the number of milliseconds since midnight of January 1, 1970 UTC.

Question 7/15

😊 Your answer was correct 🙁 Your answer was incorrect

How would you set the minutes of a `Date` object to 45?

let date = new Date();

Available answers

`date.minutes(45)`

`date.setMins(45)`

`date.setMinutes(45)`

`date.setMin(45)`

To set the minutes of a Date object to 45, you use `date.setMinutes(45)`. This method updates the minutes of the Date object.

Question 8/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which method would you use to convert a JavaScript `Date` object to a string in the format: Wed Oct 08 2023?

let date = new Date('2023-10-08');

Available answers

`date.toDateString()`

`date.format()`

`date.toString()`

`date.toLocaleDateString()`

The `toDateString()` method returns the date portion of a Date object as a string in a human-readable format like `Wed Oct 08 2023`.

Question 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

How can the `Date.UTC()` method be used in JavaScript?

Available answers

It sets a Date object to UTC time.

It converts a Date object to a string in UTC format.

It creates a Date object in UTC but returns it as milliseconds.

It formats a Date object to UTC time.

The `Date.UTC()` method accepts date components and returns the number of milliseconds since January 1, 1970, UTC. It doesn't create a Date object but gives a timestamp.

Question 10/15

😊 Your answer was correct 🙁 Your answer was incorrect

How can you get the last day of a particular month using JavaScript `Date`? (e.g., how to get the last day of February 2023)

let year = 2023;
let month = 1; // February
let date = new Date(year, month + 1, 0);

Available answers

By setting the day to 0 of the next month

Using a hardcoded list of days per month

By checking each day's validity from day 28 up to 31

Using `date.getLastDayOfMonth()`

Setting the day to 0 of the next month gives the last day of the preceding month. Here, `new Date(year, month + 1, 0)` results in the last day of February.

Question 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which of the following will return the day of the week from a JavaScript `Date` object?

let date = new Date('2023-10-08');

Available answers

`date.day()`

`date.getDate()`

`date.getDayOfWeek()`

`date.getDay()`

The method `getDay()` on a Date object returns the day of the week as a number, where Sunday is 0, Monday is 1, and so on.

Question 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the purpose of the JavaScript `Date` object?

Available answers

To manipulate strings

To handle Boolean values

To perform arithmetic operations

To create, manage, and format dates and times

The JavaScript `Date` object is used for creating, managing, and formatting dates and times. It provides methods for getting and setting the year, month, day, hour, minute, second, and millisecond individually.

Question 13/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you get the month index from a JavaScript `Date` object (e.g., January is 0)?

let date = new Date('2023-10-08');

Available answers

`date.getMonth()`

`date.getMonthIndex()`

`date.month()`

`date.getMonths()`

The `getMonth()` method returns the month index of a Date object, where January is 0, February is 1, and so on.

Question 14/15

😊 Your answer was correct 🙁 Your answer was incorrect

How can you set the year of a JavaScript `Date` object to 2025?

let date = new Date();

Available answers

`date.setYear(2025)`

`date.setFullYear(2025)`

`date.setDate(2025)`

`date.setMonth(2025)`

To set the year of a `Date` object, use the `setFullYear()` method. For example, `date.setFullYear(2025)` will set the year to 2025.

Question 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is a valid reason to use `Date.parse()` in JavaScript?

Available answers

To convert a date string into the number of milliseconds since January 1, 1970

To format a Date object to a string

To get the current date and time

To calculate the difference between two dates

`Date.parse()` is used to parse a date string and return the number of milliseconds between the date represented by the string and midnight of January 1, 1970.