Pandas: select all dates with specific month and day

Question

I have a dataframe full of dates and I would like to select all dates where the month==12 and the day==25 and add replace the zero in the xmas column with a 1.<

Answer 1

Pandas Series with datetime now behaves differently. See .dt accessor.

This is how it should be done now:

df.loc[(df['date'].dt.day==25) & (cust_df['date'].dt.month==12), 'xmas'] = 1