old_contents: import pandas as pd
  
  def import_logfile(file_name):
      """Read in an AJA logfile to a pandas.DataFrame object indexed by datetime."""
      df = pd.read_csv(file_name, sep='\t', parse_dates=[[0,1]], infer_datetime_format=True, index_col=0)
      return df
  
new_contents: import dateutil.parser as dp
  import pandas as pd
  
  def import_logfile(file_name):
      """Read in an AJA logfile to a pandas.DataFrame object indexed by datetime."""
      df = pd.read_csv(file_name, sep='\t', parse_dates=[[0,1]], date_parser=dp.parse, index_col=0)
      return df
  
subject: fix importing of datetimes so it works for AM/PM