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JavaScript Date and Time Manipulation Quiz

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Question 1/15

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.getTime()`

`date.now()`

`date.toMilliseconds()`

`date.getMilliseconds()`

Question 2/15

Which method can you use to convert a `Date` object to a string with only the time part, in the local time zone?

let date = new Date();

Select your answer

`date.toLocaleTimeString()`

`date.toTimeString()`

`date.toISOString()`

`date.timeString()`

Question 3/15

What is the method for setting the day of the month for a `Date` object in JavaScript?

let date = new Date();

Select your answer

`date.setDate()`

`date.setDay()`

`date.setMonth()`

`date.setMonthDay()`

Question 4/15

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

let date = new Date();

Select your answer

`date.getMinutes()`

`date.getMinute()`

`date.getMins()`

`date.minutes()`

Question 5/15

How do you create a new `Date` object representing the current date and time in JavaScript?

Select your answer

`Date.now()`

`new Date()`

`Date.today()`

`currentDate()`

Question 6/15

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.getMonths()`

`date.month()`

`date.getMonthIndex()`

`date.getMonth()`

Question 7/15

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

let date = new Date();

Select your answer

`date.setMins(45)`

`date.setMinutes(45)`

`date.minutes(45)`

`date.setMin(45)`

Question 8/15

If you have a `Date` object and you want to format it to 'YYYY-MM-DD' format, which method would you use in combination with manual string construction?

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

Select your answer

Use `date.toLocaleDateString()`

Use `getFullYear()`, `getMonth()`, and `getDate()` combined with a string template

Use `date.toISOString()` and slice the string

There is a built-in `date.toFormattedString()`

Question 9/15

How can you add one hour to a `Date` object in JavaScript?

let date = new Date();

Select your answer

`date.addHour()`

`date.incrementHour()`

`date.setHours(date.getHours() + 1)`

`date.addHours(1)`

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

Using a hardcoded list of days per month

Using `date.getLastDayOfMonth()`

By setting the day to 0 of the next month

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

Question 11/15

Which method would you use to get the UTC date of a `Date` object in JavaScript?

let date = new Date();

Select your answer

`date.getUTCMonth()`

`date.getUTCDay()`

`date.getUTCDate()`

`date.getUTCFullDay()`

Question 12/15

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

Select your answer

To manipulate strings

To perform arithmetic operations

To create, manage, and format dates and times

To handle Boolean values

Question 13/15

What does the `toISOString` method do when called on a JavaScript `Date` object?

let date = new Date('2023-10-08T12:00:00');

Select your answer

Converts the Date object to an ISO 8601 formatted string

Returns the Date object as a number

Returns the time zone of the Date object

Converts the Date object to a local date string

Question 14/15

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

Select your answer

jQuery

moment.js

lodash

underscore.js

Question 15/15

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

Select your answer

As the number of milliseconds since January 1, 1970 UTC

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

As string representations of each date component

As objects with named properties

Your Results

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Your Answers

Question 1/15

😊 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.getTime()`

`date.now()`

`date.toMilliseconds()`

`date.getMilliseconds()`

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

Question 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which method can you use to convert a `Date` object to a string with only the time part, in the local time zone?

let date = new Date();

Available answers

`date.toLocaleTimeString()`

`date.toTimeString()`

`date.toISOString()`

`date.timeString()`

The `toLocaleTimeString()` method converts the time portion of a Date object to a string, using the current locale's formatting conventions.

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the method for setting the day of the month for a `Date` object in JavaScript?

let date = new Date();

Available answers

`date.setDate()`

`date.setDay()`

`date.setMonth()`

`date.setMonthDay()`

The `setDate()` method sets the day of the month for a date, taking a number from 1 to 31.

Question 4/15

😊 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.getMinutes()`

`date.getMinute()`

`date.getMins()`

`date.minutes()`

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

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you create a new `Date` object representing the current date and time in JavaScript?

Available answers

`Date.now()`

`new Date()`

`Date.today()`

`currentDate()`

In JavaScript, you create a new Date object representing the current date and time by using `new Date()`. This uses the system's current time and date.

Question 6/15

😊 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.getMonths()`

`date.month()`

`date.getMonthIndex()`

`date.getMonth()`

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

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.setMins(45)`

`date.setMinutes(45)`

`date.minutes(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

If you have a `Date` object and you want to format it to 'YYYY-MM-DD' format, which method would you use in combination with manual string construction?

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

Available answers

Use `date.toLocaleDateString()`

Use `getFullYear()`, `getMonth()`, and `getDate()` combined with a string template

Use `date.toISOString()` and slice the string

There is a built-in `date.toFormattedString()`

For manual formatting, use `date.getFullYear()`, `date.getMonth()`, adjusting month to `+1` for 1-indexing, and `date.getDate()`. Combine these in a formatted string like `YYYY-MM-DD`.

Question 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

How can you add one hour to a `Date` object in JavaScript?

let date = new Date();

Available answers

`date.addHour()`

`date.incrementHour()`

`date.setHours(date.getHours() + 1)`

`date.addHours(1)`

To add one hour to a `Date` object, use the `setHours` method with the `getHours` method, like this: `date.setHours(date.getHours() + 1)`. This increments the hour by 1.

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

Using a hardcoded list of days per month

Using `date.getLastDayOfMonth()`

By setting the day to 0 of the next month

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

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 method would you use to get the UTC date of a `Date` object in JavaScript?

let date = new Date();

Available answers

`date.getUTCMonth()`

`date.getUTCDay()`

`date.getUTCDate()`

`date.getUTCFullDay()`

The `getUTCDate()` method returns the day of the month as a number (1-31) according to universal time (UTC).

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 perform arithmetic operations

To create, manage, and format dates and times

To handle Boolean values

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

What does the `toISOString` method do when called on a JavaScript `Date` object?

let date = new Date('2023-10-08T12:00:00');

Available answers

Converts the Date object to an ISO 8601 formatted string

Returns the Date object as a number

Returns the time zone of the Date object

Converts the Date object to a local date string

The `toISOString()` method returns a string in simplified extended ISO 8601 format (YYYY-MM-DDTHH:mm:ss.sssZ), which is a widely-used format for date/time representations.

Question 14/15

😊 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

jQuery

moment.js

lodash

underscore.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 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

As the number of milliseconds since January 1, 1970 UTC

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

As string representations of each date component

As objects with named properties

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