Decoding date formats using d3.js version 4

Currently diving into the world of coding with d3.js by working on my very first d3 mini project, following the Free Code Camp curriculum. The goal is to create a basic bar graph using this json file. However, I've hit a roadblock while trying to format the dates within the file. Despite referencing the d3.js API, I'm still struggling. Any advice or guidance would be greatly appreciated! Below is a snippet of my code:

    // defining dimensions and margins for the graph
var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

// creating a function to parse time data
var parseDate = d3.timeFormat("%Y-%m-%d");

// setting up scale ranges
var x = d3.scaleBand().rangeRound([0, width]).padding(0.1);
var y = d3.scaleLinear().range([height, 0],0.5);

// appending the svg element to the page body
var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", 
          "translate(" + margin.left + "," + margin.top + ")");


//setting up axis


// fetching the data
d3.json("https://raw.githubusercontent.com/FreeCodeCamp/ProjectReferenceData/master/GDP-data.json").get(function(error, dataset){
  var d = dataset.data;
  d.forEach(function(datum, i) {
        d[0] = parseDate(datum[0]);
         //console.log(datum[1]);
    });
  //console.log(d[3][0]);

});

Answer №1

If you're looking to parse time, use timeParse instead of timeFormat:

var parseDate = d3.timeParse("%Y-%m-%d");

When using timeParse,

the function will parse a specified string and return the corresponding date or null if it couldn't be parsed based on the format specifier provided.

Make sure your forEach function looks like this:

data.forEach(function(d) {
    d[0] = parseDate(d[0]);
});

Check out this demo:

var parseDate = d3.timeParse("%Y-%m-%d");

d3.json("https://raw.githubusercontent.com/FreeCodeCamp/ProjectReferenceData/master/GDP-data.json", function(json) {

    var data = json.data;

    data.forEach(function(d) {
        d[0] = parseDate(d[0]);
    });
  
    console.log(data);
  
});
<script src="https://d3js.org/d3.v4.min.js"></script>

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