Correctly import a column with date formatting

Question

I have a df with a date column:

import pandas as pd
df=pd.read_csv("patients_by_day.csv", sep=";")
df.head()
DATE        N_PAT   
20200303    1
20200307    1
20200311    1
20200314    2
20200316    4

df.DATE
0         20200303
1         20200307
2         20200311
3         20200314
4         20200316
            ...   
193228    20210703
193229    20210704
Name: DATE, Length: 193230, dtype: int64

So, as you can see, I'm not importing properly that column.

It has the format YYYYMMDD, and I would like to see it as a date type with the format YYYY-MM-DD.

I was looking to solve this problem but couldn't find any way.