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D3.js | d3.utcDay() Function

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:

3
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