title: TypeError: Cannot cast array data from dtype('O') to dtype('<M8[D]') according to the rule 'safe'
body: <p>I wanted to apply simple function which checks whether a day is business day, I'm pulling data from Excel:</p>
  <pre><code>import pandas as pd
  import numpy as np
  
  df['date'] = df['date'].dt.date
  df['is_bd'] = np.is_busday(df['date'])
  </code></pre>
  <p>It throws me an error. I understand there is type error for my 'date' column but no idea which is correct to use in this case :</p>
  <pre><code>TypeError: Iterator operand 0 dtype could not be cast from dtype('&lt;M8[us]') to dtype('&lt;M8[D]') according to the rule 'safe'
  </code></pre>