title: how to group dates per week and then value count them
body: <p>i have a data set with dates and values in other column.
  I want to group then 7 dates and then value count them.
  Current value_count give some output like below.
  df_clean.CreationDate.value_counts()</p>
  
  <p>df_clean.CreationDate.value_counts()</p>
  
  <pre><code>df_clean.CreationDate.value_counts()
  </code></pre>
  
  <pre><code>Output now look like this
  04/01/2019    133
  07/01/2019     95
  04/02/2019     90
  06/11/2019     86
  01/07/2019     81
  04/03/2019     81
  22/07/2019     73
  03/04/2019     72
  14/01/2019     68
  28/01/2019     66
  04/08/2019     66
  18/02/2019     66
  24/06/2019     65
  01/08/2019     64
  06/03/2019     63
  02/04/2019     63
  01/11/2019     62
  15/07/2019     61
  02/11/2019     61
  02/05/2019     59
  14/02/2019     59
  16/01/2019     58
  23/07/2019     57
  27/05/2019     54
  20/05/2019     54
  18/03/2019     54
  17/01/2019     53
  25/02/2019     53
  23/04/2019     53
  07/08/2019     53
  </code></pre>
  
  <p>I want it to look like this or similar</p>
  
  <pre><code>1/1/2019 - 7/1/2019 333
  8/1/2019 - 14/1/2019 232
  </code></pre>