Answers for "pandas datetime column from year month"

extract year from datetime pandas

df['date'] = pd.to_datetime(df['date'],format='%Y%m%d')
df['year'] = pd.DatetimeIndex(df['date']).year
df['month'] = pd.DatetimeIndex(df['date']).month

python take the month of date in new column

#pandas datetimeindex docs: https://pandas.pydata.org/pandas-docs/stable/generated/pandas.DatetimeIndex.html
df['month'] = pd.DatetimeIndex(df['birth_date']).month
df.head()