datetime pandas year from data code example

Example 1: 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

Example 2: month from datetime pandas

#Exctract month and create a dedicated column df["Month"] from a 
#column in datetime format df["Date"]
df['Month'] = pd.DatetimeIndex(df['Date']).month

Example 3: groupby year datetime pandas

data.groupby(data.date.dt.year)