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

Question

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

User · Answer

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

User · Answer

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

User · Answer

You could format the dates before you add them to your array  That is how I did  I used AngularJS    convert the date to a standard format  var dt   new Date date       take only the date and month and push them to your label array   rootScope charts mainChart labels push dt getDate      -     dt getMonth     1      Use this array in your chart presentation

User · Answer

I had a different use case   I want different formats based how long between start and end time of data in graph   I found this to be simplest approach      xAxes             type   time           time                displayFormats                    hour   hA                                   display  true          ticks                reverse  true                    gridLines   display  false               if more than two days between start and end of data   set format to show date   not hrs     if   parseInt Cookies get  epoch max    - parseInt Cookies get  epoch min      gt   1000 60 60 24 2             xAxes time displayFormats hour    MMM D

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

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