D3.js | d3.utcDay() Function

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The d3.utcDay() function in D3.js is used to return date in “YYYY-MM-DD” format in Coordinated Universal Time (UTC).

Syntax:

d3.utcDay(Date);

Parameters: This function accepts a parameter “Date”.

Return Value: This function returns the given date in a specific format.

Below programs illustrate the d3.utcDay() function in D3.js:
Example 1:

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src= 
            "https://d3js.org/d3.v4.min.js"> 
  </script> 
</head> 
  
<body> 
  
    <script> 
        // Initialising a current date 
        var now = new Date; 
  
        // calling d3.utcDay() 
        var day = d3.utcDay(now); 
  
        // Getting the date 
        console.log(day); 
    </script> 
</body> 
  
</html> 

Output:

"2019-07-20T00:00:00.000Z"

Example 2: Below code calculates the difference between two given dates.

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src= 
            "https://d3js.org/d3.v4.min.js"> 
  </script> 
</head> 
  
<body> 
  
    <script> 
        // Initialising start and end date 
        var start = new Date(2015, 02, 01); 
        var end = new Date(2015, 02, 04); 
  
        // Calling the utcDay() function to 
        // calculate the difference between two dates 
        var a = d3.utcDay.count(start, end); 
  
        // Getting the calculated dates 
        console.log(a); 
    </script> 
</body> 
  
</html> 

Output:

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