The d3.utcHours() function in D3.js is used to return all the hours with date in the given range of start and end time in Coordinated Universal Time (UTC).
Syntax:
d3.utcHours(start, end, step);
Parameters: This function accept three parameters which are given below:
- Start: This parameter holds the given start time.
- end: This parameter holds the given end time.
- step: This is the optional value used to skip hours.
Return Value: This function returns all the possible hours in the given range.
Below programs illustrate the d3.utcHours() function in D3.js:
Example 1:
<!DOCTYPE html> <html>    <head>       <title>           D3.js | d3.utcHours() Function       </title>       <script src =       </script>    </head>       <body>                <script>                   // Initialising start and end time          var start = new Date(2015, 07, 01, 4, 20);          var end = new Date(2015, 07, 01, 8, 20);                     // Calling the utcHours() function          // without step value          var a = d3.utcHours(start, end);                     // Getting the hours values          console.log(a);       </script>    </body> </html> |
Output:
["2015-07-31T23:00:00.000Z", "2015-08-01T00:00:00.000Z", "2015-08-01T01:00:00.000Z", "2015-08-01T02:00:00.000Z"]
Example 2:
<!DOCTYPE html> <html>    <head>       <title>           D3.js | d3.utcHours() Function       </title>       <script src =       </script>    </head>       <body>                <script>                   // Initialising start and end time          var start = new Date(2015, 07, 01, 1, 20);          var end = new Date(2015, 07, 01, 6, 20);                     // Calling the utcHours() function          // with step value          var a = d3.utcHours(start, end, 2);                     // Getting the hour values          console.log(a);       </script>    </body> </html> |
Output:
["2015-07-31T20:00:00.000Z", "2015-07-31T22:00:00.000Z", "2015-08-01T00:00:00.000Z"]
Reference: https://devdocs.io/d3~5/d3-time#timeHours
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