how to display month in d3 code example

Example: display only the month in d3

var svg = d3.select("body")
  .append("svg")
  .attr("width", 500)
  .attr("height", 100)   
            
var xScale = d3.scaleTime()
  .domain([new Date("2014-01-01"), new Date("2016-01-01")])
  .range([0, 450]);
        
var xAxis = d3.axisBottom(xScale)
  .tickFormat(d3.timeFormat("%b"));
  
svg.append("g")
  .call(xAxis);