title: Plotly: How to plot just month and day on x axis? (Ignore year)
body: <p>I am trying to plot timeseries data and would like the x axis to just be Month and Day. Plotly requires format to be <code>yyyy-mm-dd</code>, but I have daily averages from a data set over a few years, so I just want to plot <code>mm-dd</code> on the x axis. When I send a datetime that is just <code>mm-dd</code> it assumes the <code>mm</code> to be the year. Can I get it to bypass the year and only take <code>mm-dd</code>?</p>
  
  <pre><code>df_en_ave1.index = df_en_ave1.index.strftime('%m-%d') #convert my index to month and day datetime
  
  trace1=go.Scatter(x=df_en_ave1.index, y=df_en_ave1.evap) #need to bypass year in date here somehow
  
  data = [trace1]
  
  plotly.offline.iplot(data)
  </code></pre>