python - Subtract a year from a datetime column in pandas

Question

I have a datetime column as below -

>>> df['ACC_DATE'].head(2)
538   2006-04-07
550   2006-04-12
Name: ACC_DATE, dtype: datetime64[ns]

Now, I want to subtract an year from each row of this column. How can I achieve the same & which library can I use?

The expected field -

        ACC_DATE    NEW_DATE
538   2006-04-07  2005-04-07
549   2006-04-12  2005-04-12

Answer 1

You can use DateOffset to achieve this:

In[88]:
df['NEW_DATE'] = df['ACC_DATE'] - pd.DateOffset(years=1)
df

Out[88]: 
        ACC_DATE   NEW_DATE
index                      
538   2006-04-07 2005-04-07
550   2006-04-12 2005-04-12