import pandas as pd
df = pd.DataFrame({
'start': ['11/20/2018 3:00:13 PM', '12/22/2019 4:00:12 PM', '10/10/2018 2:02:19 PM'],
'end': ['11/23/2017 6:45:00 AM', '1/10/2020 4:50:11 AM', '10/07/2018 1:04:15 PM']
})
result = pd.DataFrame(df[
pd.to_datetime(df['start'], format='%m/%d/%Y %I:%M:%S %p') <
pd.to_datetime(df['end'], format='%m/%d/%Y %I:%M:%S %p')
])
print(result)
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