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JavaScript | date.toJSON() function

The date.toJSON() is an inbuilt function in JavaScript which is used to convert the given date object’s contents into a string.The date object is created using date() constructor.
In the below syntax, DateObj is a valid Date object created using Date() constructor whose contents are converted into string.
Syntax:

dateObj.toJSON()
Parameters: This function does not takes any parameter.
It is just used along with a Date object created using Date() conctructor.
Return Value : It return the converted string 
of Date() constructor contents.

Below program illustrate the date.toJSON() function:-

// Here a date has been assigned
// while creating Date object
var dateobj = new Date('October 15, 1996 05:35:32');
  
// Contents of above date object is converted
// into a string using toJSON() function.
var B = dateobj.toJSON();
  
// Printing the converted string.
console.log(B);

Output:

> "1996-10-15T00:05:32.000Z"

Errors and Exceptions

Code #1 : Here nothing as parameter is passed while creating date object but still toJSON() function return current day name, month name, date, year and time.



// Here nothing has been assigned
// while creating Date object
var dateobj = new Date();
  
// Contents of above date object is
// converted into a string using toJSON() function.
var B = dateobj.toJSON();
  
// Printing the converted string.
console.log(B);

/div>

Output:

> "2018-04-23T11:24:14.955Z"

Code #2 : When some random list of values is passed, then toJSON() function return the corresponding produced string.
The format for Date() constructor is like Date(month, date, year, time). By following this format some values is given in the below program and corresponding string is produced as output. Time format should be like (number:number:number).

// Here some different values has been
// assigned while creating Date object
var dateobj1 = new Date('1');
var dateobj2 = new Date('2, 3');
var dateobj3 = new Date('4, 5, 6');
var dateobj4 = new Date('4, 5, 6, 11:00:12');
var dateobj5 = new Date('12, 5, 4, 0:0');
  
// Contents of above date objects is converted
// into strings using toJSON() function.
var B = dateobj1.toJSON();
var C = dateobj2.toJSON();
var D = dateobj3.toJSON();
var E = dateobj4.toJSON();
var F = dateobj5.toJSON();
  
// Printing the converted string.
console.log(B);
console.log(C);
console.log(D);
console.log(E);
console.log(F);

Output:

> "2000-12-31T18:30:00.000Z"
> "2001-02-02T18:30:00.000Z"
> "2006-04-04T18:30:00.000Z"
> "2006-04-05T05:30:12.000Z"
> "2004-12-04T18:30:00.000Z"

Important Points

Months, Date, hour, minute, second and millisecond must be in their respective range of 0 to 11 for months, 1 to 31 for date, 0 to 23 for hours, 0 to 59 for minute, 0 to 59 second, 0 to 999 for milliseconds otherwise toJSON() function return null.
Let’s see JavaScript code on this out of range topic:
Code #1: Here date given as of 45 which is out of range of date that is why below code gives output as null.

// Here a date has been assigned
// while creating Date object
var dateobj = new Date('October 45, 1996 05:35:32');
  
// Contents of above date object is converted
// into a string using toJSON() function.
var B = dateobj.toJSON();
  
// Printing the converted string.
console.log(B);

Output:

> null


This article is attributed to GeeksforGeeks.org

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