How to format x-axis time scale values in Chart.js v2

I am able to format the tooltips when I hover over a datapoint on a line chart via options.scales.xAxes.time.tooltipFormat, but I can't seem to do it for the x-axis tick lables. My data.labels is an array of moment objects. They display as "MMM DD, YYYY" (e.g. Feb 23, 2012), but I want to drop the year.

Solution 1:

Just set all the selected time unit's displayFormat to MMM DD

options: {
  scales: {
    xAxes: [{
      type: 'time',
      time: {
        displayFormats: {
           'millisecond': 'MMM DD',
           'second': 'MMM DD',
           'minute': 'MMM DD',
           'hour': 'MMM DD',
           'day': 'MMM DD',
           'week': 'MMM DD',
           'month': 'MMM DD',
           'quarter': 'MMM DD',
           'year': 'MMM DD',
        }
        ...

Notice that I've set all the unit's display format to MMM DD. A better way, if you have control over the range of your data and the chart size, would be force a unit, like so

options: {
  scales: {
    xAxes: [{
      type: 'time',
      time: {
        unit: 'day',
        unitStepSize: 1,
        displayFormats: {
           'day': 'MMM DD'
        }
        ...

Fiddle - http://jsfiddle.net/prfd1m8q/

Solution 2:

as per the Chart js documentation page tick configuration section. you can format the value of each tick using the callback function. for example I wanted to change locale of displayed dates to be always German. in the ticks parts of the axis options

ticks: {
    callback: function(value) { 
        return new Date(value).toLocaleDateString('de-DE', {month:'short', year:'numeric'}); 
    },
},