JavaScript Date Object Cheatsheet-JS Tutorial-php.cn

JavaScript Date Object Cheatsheet

DDD

Release： 2024-12-01 19:03:12

Original

352 people have browsed it

JavaScript Date Object Cheatsheet

The Date object in JavaScript is used to work with dates and times. It provides methods to create, manipulate, and format date and time values.

Creating Dates

You can create a Date object in multiple ways:

Current Date and Time:

   const now = new Date();
   console.log(now); // Current date and time

Copy after login

Specific Date:

   const specificDate = new Date(2024, 10, 21); // Year, Month (0-based), Day
   console.log(specificDate); // Thu Nov 21 2024

Copy after login

From a String:

   const fromString = new Date("2024-11-21T10:00:00");
   console.log(fromString); // Thu Nov 21 2024 10:00:00 GMT

Copy after login

From Timestamps (milliseconds since Unix epoch):

   const fromTimestamp = new Date(1732231200000);
   console.log(fromTimestamp); // Thu Nov 21 2024 10:00:00 GMT

Copy after login

Common Methods

Getting Date and Time

Method	Description	Example
getFullYear()	Returns the year	date.getFullYear() -> 2024
getMonth()	Returns the month (0-11)	date.getMonth() -> 10 (November)
getDate()	Returns the day of the month (1-31)	date.getDate() -> 21
getDay()	Returns the weekday (0-6, Sun=0)	date.getDay() -> 4 (Thursday)
getHours()	Returns the hour (0-23)	date.getHours() -> 10
getMinutes()	Returns the minutes (0-59)	date.getMinutes() -> 0
getSeconds()	Returns the seconds (0-59)	date.getSeconds() -> 0
getTime()	Returns timestamp in milliseconds	date.getTime() -> 1732231200000

Method

Description

Example

getFullYear()

Returns the year

date.getFullYear() -> 2024

getMonth()

Returns the month (0-11)

date.getMonth() -> 10 (November)

getDate()

Returns the day of the month (1-31)

date.getDate() -> 21

getDay()

Returns the weekday (0-6, Sun=0)

date.getDay() -> 4 (Thursday)

getHours()

Returns the hour (0-23)

date.getHours() -> 10

getMinutes()

Returns the minutes (0-59)

date.getMinutes() -> 0

getSeconds()

Returns the seconds (0-59)

date.getSeconds() -> 0

getTime()

Returns timestamp in milliseconds

date.getTime() -> 1732231200000

Method	Description	Example
setFullYear(year)	Sets the year	date.setFullYear(2025)
setMonth(month)	Sets the month (0-11)	date.setMonth(0) -> January
setDate(day)	Sets the day of the month	date.setDate(1) -> First day of the month
setHours(hour)	Sets the hour (0-23)	date.setHours(12)
setMinutes(minutes)	Sets the minutes (0-59)	date.setMinutes(30)
setSeconds(seconds)	Sets the seconds (0-59)	date.setSeconds(45)

Setting Date and Time

Method	Description	Example
setFullYear(year)	Sets the year	date.setFullYear(2025)
setMonth(month)	Sets the month (0-11)	date.setMonth(0) -> January
setDate(day)	Sets the day of the month	date.setDate(1) -> First day of the month
setHours(hour)	Sets the hour (0-23)	date.setHours(12)
setMinutes(minutes)	Sets the minutes (0-59)	date.setMinutes(30)
setSeconds(seconds)	Sets the seconds (0-59)	date.setSeconds(45)

Formatting Dates

Method	Description	Example
toDateString()	Returns date as a human-readable string	date.toDateString() -> "Thu Nov 21 2024"
toISOString()	Returns date in ISO format	date.toISOString() -> "2024-11-21T10:00:00.000Z"
toLocaleDateString()	Returns date in localized format	date.toLocaleDateString() -> "11/21/2024"
toLocaleTimeString()	Returns time in localized format	date.toLocaleTimeString() -> "10:00:00 AM"

Method

Description

Example

toDateString()

Returns date as a human-readable string

date.toDateString() -> "Thu Nov 21 2024"

toISOString()

Returns date in ISO format

date.toISOString() -> "2024-11-21T10:00:00.000Z"

toLocaleDateString()

Returns date in localized format

date.toLocaleDateString() -> "11/21/2024"

toLocaleTimeString()

Returns time in localized format

date.toLocaleTimeString() -> "10:00:00 AM"

Common Use Cases

   const now = new Date();
   console.log(now); // Current date and time

Copy after login

   const specificDate = new Date(2024, 10, 21); // Year, Month (0-based), Day
   console.log(specificDate); // Thu Nov 21 2024

Copy after login

   const fromString = new Date("2024-11-21T10:00:00");
   console.log(fromString); // Thu Nov 21 2024 10:00:00 GMT

Copy after login

   const fromTimestamp = new Date(1732231200000);
   console.log(fromTimestamp); // Thu Nov 21 2024 10:00:00 GMT

Copy after login

   const startDate = new Date("2024-11-01");
   const endDate = new Date("2024-11-21");
   const diffInTime = endDate - startDate; // Difference in milliseconds
   const diffInDays = diffInTime / (1000 * 60 * 60 * 24); // Convert to days
   console.log(diffInDays); // 20

Copy after login

   const targetDate = new Date("2024-12-31T23:59:59");
   setInterval(() => {
       const now = new Date();
       const timeLeft = targetDate - now; // Milliseconds left
       const days = Math.floor(timeLeft / (1000 * 60 * 60 * 24));
       const hours = Math.floor((timeLeft / (1000 * 60 * 60)) % 24);
       const minutes = Math.floor((timeLeft / (1000 * 60)) % 60);
       const seconds = Math.floor((timeLeft / 1000) % 60);
       console.log(`${days}d ${hours}h ${minutes}m ${seconds}s`);
   }, 1000);

Copy after login

Add/Subtract Days

:

Pro Tips

   const now = new Date();
   const formatted = `${now.getFullYear()}-${now.getMonth() + 1}-${now.getDate()}`;
   console.log(formatted); // "2024-11-21"

Copy after login

Use

to get the current timestamp directly without creating a Date object:
Be mindful of time zones
when working with dates across regions. Use libraries like
or
Day.js for advanced handling.

To avoid month off-by-one errors, remember that months are

0-indexed

(0 = January, 11 = December).

The above is the detailed content of JavaScript Date Object Cheatsheet. For more information, please follow other related articles on the PHP Chinese website!