Given the following data frame and necessary wrangling:
import pandas as pd df=pd.DataFrame({\'A\':[\'a\',\'b\',\'c\'], \'dates\':[\'2015-08-31 00:00
You can use dt.date to return a datetime.date object:
datetime.date
In [3]: set(df['dates'].dt.date) Out[3]: {datetime.date(2015, 8, 24), datetime.date(2015, 8, 25), datetime.date(2015, 8, 31)}