All date function in javascript

JavaScript Date Objects

JavaScript Date Objects let us work with dates:

Examples

Note

Date objects are static. The «clock» is not «running».

The computer clock is ticking, date objects are not.

JavaScript Date Output

By default, JavaScript will use the browser’s time zone and display a date as a full text string:

You will learn much more about how to display dates, later in this tutorial.

Creating Date Objects

Date objects are created with the new Date() constructor.

There are 9 ways to create a new date object:

new Date()
new Date(date string)

new Date(year,month)
new Date(year,month,day)
new Date(year,month,day,hours)
new Date(year,month,day,hours,minutes)
new Date(year,month,day,hours,minutes,seconds)
new Date(year,month,day,hours,minutes,seconds,ms)

JavaScript new Date()

new Date() creates a date object with the current date and time:

Example

new Date(date string)

new Date(date string) creates a date object from a date string:

Examples

Date string formats are described in the next chapter.

new Date(year, month, . )

new Date(year, month, . ) creates a date object with a specified date and time.

7 numbers specify year, month, day, hour, minute, second, and millisecond (in that order):

Example

Note

JavaScript counts months from 0 to 11:

Specifying a month higher than 11, will not result in an error but add the overflow to the next year:

Specifying a day higher than max, will not result in an error but add the overflow to the next month:

Using 6, 4, 3, or 2 Numbers

6 numbers specify year, month, day, hour, minute, second:

Example

5 numbers specify year, month, day, hour, and minute:

Example

4 numbers specify year, month, day, and hour:

Example

3 numbers specify year, month, and day:

Example

2 numbers specify year and month:

Example

You cannot omit month. If you supply only one parameter it will be treated as milliseconds.

Example

Previous Century

One and two digit years will be interpreted as 19xx:

Example

Example

JavaScript Stores Dates as Milliseconds

JavaScript stores dates as number of milliseconds since January 01, 1970.

Zero time is January 01, 1970 00:00:00 UTC.

One day (24 hours) is 86 400 000 milliseconds.

Now the time is: milliseconds past January 01, 1970

new Date(milliseconds)

new Date(milliseconds) creates a new date object as milliseconds plus zero time:

Examples

01 January 1970 plus 100 000 000 000 milliseconds is:

January 01 1970 minus 100 000 000 000 milliseconds is:

January 01 1970 plus 24 hours is:

01 January 1970 plus 0 milliseconds is:

Date Methods

When a date object is created, a number of methods allow you to operate on it.

Date methods allow you to get and set the year, month, day, hour, minute, second, and millisecond of date objects, using either local time or UTC (universal, or GMT) time.

Date methods and time zones are covered in the next chapters.

Displaying Dates

JavaScript will (by default) output dates using the toString() method. This is a string representation of the date, including the time zone. The format is specified in the ECMAScript specification:

Example

When you display a date object in HTML, it is automatically converted to a string, with the toString() method.

Example

The toDateString() method converts a date to a more readable format:

Example

The toUTCString() method converts a date to a string using the UTC standard:

Example

The toISOString() method converts a date to a string using the ISO standard:

Example

Complete JavaScript Date Reference

For a complete Date reference, go to our:

The reference contains descriptions and examples of all Date properties and methods.

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JavaScript Date Reference

There are four ways of instantiating (creating) a date:

Examples

See Also:

JavaScript Date Methods and Properties

Name	Description
constructor	Returns the function that created the Date object’s prototype
getDate()	Returns the day of the month (from 1-31)
getDay()	Returns the day of the week (from 0-6)
getFullYear()	Returns the year
getHours()	Returns the hour (from 0-23)
getMilliseconds()	Returns the milliseconds (from 0-999)
getMinutes()	Returns the minutes (from 0-59)
getMonth()	Returns the month (from 0-11)
getSeconds()	Returns the seconds (from 0-59)
getTime()	Returns the number of milliseconds since midnight Jan 1 1970, and a specified date
getTimezoneOffset()	Returns the time difference between UTC time and local time, in minutes
getUTCDate()	Returns the day of the month, according to universal time (from 1-31)
getUTCDay()	Returns the day of the week, according to universal time (from 0-6)
getUTCFullYear()	Returns the year, according to universal time
getUTCHours()	Returns the hour, according to universal time (from 0-23)
getUTCMilliseconds()	Returns the milliseconds, according to universal time (from 0-999)
getUTCMinutes()	Returns the minutes, according to universal time (from 0-59)
getUTCMonth()	Returns the month, according to universal time (from 0-11)
getUTCSeconds()	Returns the seconds, according to universal time (from 0-59)
getYear()	Deprecated. Use the getFullYear() method instead
now()	Returns the number of milliseconds since midnight Jan 1, 1970
parse()	Parses a date string and returns the number of milliseconds since January 1, 1970
prototype	Allows you to add properties and methods to an object
setDate()	Sets the day of the month of a date object
setFullYear()	Sets the year of a date object
setHours()	Sets the hour of a date object
setMilliseconds()	Sets the milliseconds of a date object
setMinutes()	Set the minutes of a date object
setMonth()	Sets the month of a date object
setSeconds()	Sets the seconds of a date object
setTime()	Sets a date to a specified number of milliseconds after/before January 1, 1970
setUTCDate()	Sets the day of the month of a date object, according to universal time
setUTCFullYear()	Sets the year of a date object, according to universal time
setUTCHours()	Sets the hour of a date object, according to universal time
setUTCMilliseconds()	Sets the milliseconds of a date object, according to universal time
setUTCMinutes()	Set the minutes of a date object, according to universal time
setUTCMonth()	Sets the month of a date object, according to universal time
setUTCSeconds()	Set the seconds of a date object, according to universal time
setYear()	Deprecated. Use the setFullYear() method instead
toDateString()	Converts the date portion of a Date object into a readable string
toGMTString()	Deprecated. Use the toUTCString() method instead
toISOString()	Returns the date as a string, using the ISO standard
toJSON()	Returns the date as a string, formatted as a JSON date
toLocaleDateString()	Returns the date portion of a Date object as a string, using locale conventions
toLocaleTimeString()	Returns the time portion of a Date object as a string, using locale conventions
toLocaleString()	Converts a Date object to a string, using locale conventions
toString()	Converts a Date object to a string
toTimeString()	Converts the time portion of a Date object to a string
toUTCString()	Converts a Date object to a string, according to universal time
UTC()	Returns the number of milliseconds in a date since midnight of January 1, 1970, according to UTC time
valueOf()	Returns the primitive value of a Date object

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