title: How do i convert int64 to timestamp
body: <pre><code>import pandas as pd
  import urllib
  from pandas import DataFrame, Series
  import datetime
  
  url = 'https://chartapi.finance.yahoo.com/instrument/1.0/GOOG/chartdata;type=quote;range=10d/csv'
  urllib.request.urlretrieve(url, './data/goog.csv')
  GOOG= DataFrame(pd.read_csv("goog.csv"))
  
   GOOG['Timestamp']= datetime.datetime.fromtimestamp(GOOG['Timestamp']).strptime('%Y-%m-%d :%H:%M:%S)
  </code></pre>
  
  <p>In this code i was able to download intraday data off yahoo finance and then save to a csvfile. However, the dates are dtype=int64 and I'm having trouble converting it to a timestamp. I'm not sure why i can't do so.</p>