title: Pandas plot bar graph with datetime64
body: <p>I have the following dataframe: </p>
  
  <pre><code>gr_data = data.groupby([pd.Grouper(key='date', freq='W-SUN')])['name'].count()
  
  
  print(gr_data)
  
      date
      2018-08-19     582
      2018-09-02    1997
      2018-09-16    3224
      2018-10-07    4282
      2018-10-28    5618
      2018-11-04    5870
      Freq: W-SUN, Name: name, dtype: int64
  </code></pre>
  
  <p>I am plotting this data using <a href="https://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.plot.bar.html#pandas.DataFrame.plot.bar" rel="nofollow noreferrer">plot.bar()</a></p>
  
  <p><code>'date'</code> is a <code>datetime64[ns]</code> type.</p>
  
  <p>When I plot the data hours/minutes/seconds are visible. How do drop the hours/minutes/seconds?
  <a href="https://i.stack.imgur.com/2LQ1T.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2LQ1T.png" alt="enter image description here"></a></p>