df string manipulation before / after / when single digit pad zero

[metalray]

Dear Python Experts,

I have some dates that I need to clearn up.

d = {'col1': ['1/25/84', '2/8/86'],}
dfdates = pd.DataFrame(data=d)
print(dfdates)

For the first date, I want to add a zero to all single digits before the first /
as well as a 19 to ahead of all 2 digits behind the last /.

In case of the second date, I would like to add a zero to all single digits before the first / and
a zero to all single digits behind the first /.

Can someone point me in the right direction which dataframe string manipulation function I should use?