I have a dataframe `df` with a column `"date"`, I want to go from this format: 

`2018-12-11 15:26:04.877`

Into a `datetime`, where there are no microseconds and all seconds are zero:

`2018-12-11 15:26:00`

What I have done so far is: 

```
import pandas as pd
import datetime
dfdf=pd.read_excel('datefix.xlsx')

print(df.dtypes)
df.date =pd.to_datetime(df.date, errors='coerce')
print(df.date)
df["date"].datetime.replace(microsecond=0)

```

But I get the following error

```
AttributeError: 'Series' object has no attribute 'datetime'

```

Is there another way to get to the outcome desired?