pandas edit strings before datetime

import pandas as pd

df = pd.DataFrame({
    'text': [
        ' 00:00:01        ',
        '2018.06.29 00:00:01',
        'Hello 01:00:00'
    ],
})

print(df)

df['time'] = df['text'].apply(lambda x: x.strip()[-8:])

print(df)

df['time'] = pd.to_datetime(df['time'], format='%H:%M:%S')

print(df)