Difference between two dates in years, months, days in JavaScript

Difference between two dates in years, months, days in JavaScript

In this javascript Tutorial, Calculate the difference between two dates in years months and days javascript. Here, we will explain how to calculate the difference between two dates and get the difference in years months days.

In this javascript Tutorial, Calculate the difference between two dates in years months and days javascript. Here, we will explain how to calculate the difference between two dates and get the difference in years months days.

Calculate the difference between two dates in the following
  • javascript difference between two dates in the year
  • calculate the difference between two dates in month javascript
  • javascript difference between two dates in days
  • javascript difference between two dates in years months days

1. javascript difference between two dates in year

Here, we will create a javascript, which is used to calculate the difference between two dates in year.

Use the given below function, To calculate the difference between 2 dates and get the difference year.

 function yearDiff(dt1, dt2) 
     {

      var diffYear =(dt2.getTime() - dt1.getTime()) / 1000;
       diffYear /= (60 * 60 * 24);
      return Math.abs(Math.round(diffYear/365.25));

 }

Ex:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>calculate difference between two dates in year javascript</title>
</head>
<body>
  <script type = "text/javascript">
    function yearDiff(dt1, dt2) 
     {

      var diffYear =(dt2.getTime() - dt1.getTime()) / 1000;
       diffYear /= (60 * 60 * 24);
      return Math.abs(Math.round(diffYear/365.25));

     }

    dt1 = new Date("2019-11-27");
    dt2 = new Date("2019-06-28");

    var year_differnece = yearDiff(dt1, dt2)
    document.write( "calculate difference between two dates in year javascript :- " + year_differnece ); 

  </script>  
</body>
</html>

Result Of the above code is: 1 Year

2. Calculate the difference between two dates in Month javascript

Here, we will create a javascript, which is used to calculate the difference between two dates in month.

Use the given below function, To calculate the difference between 2 dates and get difference month.

function monthDiff(dt1, dt2) 
     {

      var diffMonth =(dt2.getTime() - dt1.getTime()) / 1000;
       diffMonth /= (60 * 60 * 24 * 7 * 4);
      return Math.abs(Math.round(diff));

     }

Ex:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>calculate difference between two dates in month javascript</title>
</head>
<body>
  <script type = "text/javascript">
    function monthDiff(dt1, dt2) 
     {

      var diffMonth =(dt2.getTime() - dt1.getTime()) / 1000;
       diffMonth /= (60 * 60 * 24 * 7 * 4);
      return Math.abs(Math.round(diff));

     }

    dt1 = new Date("2019-11-27");
    dt2 = new Date("2019-06-28");

    var month_differnece = monthDiff(dt1, dt2)
    document.write( "calculate difference between two dates in month javascript :- " + month_differnece ); 

  </script>  
</body>
</html>

Result Of the above code is: 5 Month

3. javascript difference between two dates in days

Here, we will create a javascript that is used to calculate the difference between two dates in days.

Use the given below function, To calculate the difference between 2 dates and get difference days.

 function daysDiff(dt1, dt2) 
     {

      // calculate the time difference of two dates JavaScript
      var diffTime =(dt2.getTime() - dt1.getTime());

      // calculate the number of days between two dates javascript
      var daysDiff = diffTime / (1000 * 3600 * 24); 

      return daysDiff;

     }

Ex:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>calculate difference between two dates in days javascript</title>
</head>
<body>
  <script type = "text/javascript">
    function daysDiff(dt1, dt2) 
     {

      // calculate the time difference of two dates JavaScript
      var diffTime =(dt2.getTime() - dt1.getTime());

      // calculate the number of days between two dates javascript
      var daysDiff = diffTime / (1000 * 3600 * 24); 

      return daysDiff;

     }

    dt1 = new Date("2019-11-27");
    dt2 = new Date("2019-11-29");

    var days = daysDiff(dt1, dt2)
    document.write( "calculate difference between two dates in days javascript :- " + days ); 

  </script>  
</body>
</html>

Result Of the above code is: 2 days

4. javascript difference between two dates in years months days

javascript difference between two dates in years months days. Here we will create a new function, which is used to calculate the difference between two dates in years, months and days.

Using the below-given function, we will calculate the difference between two dates and get years, months and days between two dates:

  function diff_year_month_day(dt1, dt2) 
     {

      var time =(dt2.getTime() - dt1.getTime()) / 1000;
      var year  = Math.abs(Math.round((time/(60 * 60 * 24))/365.25));
      var month = Math.abs(Math.round(time/(60 * 60 * 24 * 7 * 4)));
      var days = Math.abs(Math.round(time/(3600 * 24)));
      return "Year :- " + year + " Month :- " + month + " Days :-" + days;

     }

Ex:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>javascript difference between two dates in years months days</title>
</head>
<body>
  <script type = "text/javascript">
    function diff_year_month_day(dt1, dt2) 
     {

      var time =(dt2.getTime() - dt1.getTime()) / 1000;
      var year  = Math.abs(Math.round((time/(60 * 60 * 24))/365.25));
      var month = Math.abs(Math.round(time/(60 * 60 * 24 * 7 * 4)));
      var days = Math.abs(Math.round(time/(3600 * 24)));
      return "Year :- " + year + " Month :- " + month + " Days :-" + days;

     }

    dt1 = new Date("2019-11-27");
    dt2 = new Date("2018-06-28");

    var diff_year_month_day = diff_year_month_day(dt1, dt2)
    document.write( "javascript difference between two dates in years months days :- " + diff_year_month_day ); 

  </script>  
</body>
</html>

Result of above code is: Year :- 1 Month :- 18 Days :-517

If you want to know more about javascript date and time methods, you may like following date and time methods:

Programming a Javascript Simon Game Tutorial

Programming a Javascript Simon Game Tutorial

In this javascript tutorial, I recorded myself live programming an html5 javascript simon game.

In this javascript tutorial, I recorded myself live programming an html5 javascript simon game.

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Understanding Memoization And Dynamic Programming in Javascript

Understanding Memoization And Dynamic Programming in Javascript

In this Javascript tutorial I will explain what memoization is, how to use it, when you should use memoization, how to use memoization, what dynamic programming is, how to use memoization in dynamic programming. Memoization is a big complicated word that you may have never even heard before, but you may be surprised to know that you are most likely already using memoization without even realizing it.

Memoization is a big complicated word that you may have never even heard before, but you may be surprised to know that you are most likely already using memoization without even realizing it. Memoization is just the act of caching values so that they can be calculated quicker in the future. Memoization is really useful in all parts of programming, but where it is most useful is in dynamic programming. In this video I will explain what memoization is, how to use it, and why it is so useful especially in dynamic programming.

🧠 Concepts Covered:

  • What memoization is
  • When you should use memoization
  • How to use memoization
  • What dynamic programming is
  • How to use memoization in dynamic programming

JavaScript Tutorial: if-else Statement in JavaScript

JavaScript Tutorial: if-else Statement in JavaScript

This JavaScript tutorial is a step by step guide on JavaScript If Else Statements. Learn how to use If Else in javascript and also JavaScript If Else Statements. if-else Statement in JavaScript. JavaScript's conditional statements: if; if-else; nested-if; if-else-if. These statements allow you to control the flow of your program's execution based upon conditions known only during run time.

Decision Making in programming is similar to decision making in real life. In programming also we face some situations where we want a certain block of code to be executed when some condition is fulfilled.
A programming language uses control statements to control the flow of execution of the program based on certain conditions. These are used to cause the flow of execution to advance and branch based on changes to the state of a program.

JavaScript’s conditional statements:

  • if
  • if-else
  • nested-if
  • if-else-if

These statements allow you to control the flow of your program’s execution based upon conditions known only during run time.

  • if: if statement is the most simple decision making statement. It is used to decide whether a certain statement or block of statements will be executed or not i.e if a certain condition is true then a block of statement is executed otherwise not.
    Syntax:
if(condition) 
{
   // Statements to execute if
   // condition is true
}

Here, condition after evaluation will be either true or false. if statement accepts boolean values – if the value is true then it will execute the block of statements under it.
If we do not provide the curly braces ‘{‘ and ‘}’ after if( condition ) then by default if statement will consider the immediate one statement to be inside its block. For example,

if(condition)
   statement1;
   statement2;

// Here if the condition is true, if block 
// will consider only statement1 to be inside 
// its block.

Flow chart:

Example:

<script type = "text/javaScript"> 

// JavaScript program to illustrate If statement 

var i = 10; 

if (i > 15) 
document.write("10 is less than 15"); 

// This statement will be executed 
// as if considers one statement by default 
document.write("I am Not in if"); 

< /script> 

Output:

I am Not in if
  • if-else: The if statement alone tells us that if a condition is true it will execute a block of statements and if the condition is false it won’t. But what if we want to do something else if the condition is false. Here comes the else statement. We can use the else statement with if statement to execute a block of code when the condition is false.
    Syntax:
if (condition)
{
    // Executes this block if
    // condition is true
}
else
{
    // Executes this block if
    // condition is false
}


Example:

<script type = "text/javaScript"> 

// JavaScript program to illustrate If-else statement 

var i = 10; 

if (i < 15) 
document.write("10 is less than 15"); 
else
document.write("I am Not in if"); 

< /script> 

Output:

i is smaller than 15
  • nested-if A nested if is an if statement that is the target of another if or else. Nested if statements means an if statement inside an if statement. Yes, JavaScript allows us to nest if statements within if statements. i.e, we can place an if statement inside another if statement.
    Syntax:
if (condition1) 
{
   // Executes when condition1 is true
   if (condition2) 
   {
      // Executes when condition2 is true
   }
}

Example:

<script type = "text/javaScript"> 

// JavaScript program to illustrate nested-if statement 

var i = 10; 

if (i == 10) { 

// First if statement 
if (i < 15) 
	document.write("i is smaller than 15"); 

// Nested - if statement 
// Will only be executed if statement above 
// it is true 
if (i < 12) 
	document.write("i is smaller than 12 too"); 
else
	document.write("i is greater than 15"); 
} 
< /script> 

Output:

i is smaller than 15
i is smaller than 12 too
  • if-else-if ladder Here, a user can decide among multiple options.The if statements are executed from the top down. As soon as one of the conditions controlling the if is true, the statement associated with that if is executed, and the rest of the ladder is bypassed. If none of the conditions is true, then the final else statement will be executed.
if (condition)
    statement;
else if (condition)
    statement;
.
.
else
    statement;


Example:

<script type = "text/javaScript"> 
// JavaScript program to illustrate nested-if statement 

var i = 20; 

if (i == 10) 
document.wrte("i is 10"); 
else if (i == 15) 
document.wrte("i is 15"); 
else if (i == 20) 
document.wrte("i is 20"); 
else
document.wrte("i is not present"); 
< /script> 

Output:

i is 20