I have one column in I don\'t understand how but there is two different format in a single column.
df[\'Date\'] = [6/24/2019,6/14/2019,2019-09-06 00:00:00,6/
Try importing the datetime class. This will allow you to use the strptime function like below:
datetime
strptime
format = '%d/%m/%Y' data['New_date'] = datetime.strptime('2019-09-06 00:00:00', format)