I have the following dataframe and would like to create a new column based on a condition. The new column should contain 'Night' for the hours between 20:00 and 06:00, 'Morning' for the time between 06:00 and 14:30 and 'Afternoon' for the time between 14:30 and 20:00. How can I formulate and apply such a condition best way?

```
import pandas as pd

df = {'A' : ['test', '2222', '1111', '3333', '1111'],
        'B' : ['aaa', 'aaa', 'bbbb', 'ccccc', 'aaa'],
        'Date' : ['15.07.2018 06:23:56', '15.07.2018 01:23:56', '15.07.2018 06:40:06', '15.07.2018 11:38:27', '15.07.2018 21:38:27'],
        'Defect': [0, 1, 0, 1, 0]
        }

df = pd.DataFrame(df)
df['Date'] = pd.to_datetime(df['Date'])

```