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When you use strftime with a 2 digit year i.e. '32' it outputs a '32' instead of '0032'. 
This prevents parsing the string again with the same format through strftime.
Exemple:
import datetime
datetime_format="%Y"
date=datetime.date(32,1,1)
date_str=datetime.datetime.strftime(date, datetime_format)
datetime.datetime.strptime(date_str, datetime_format)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/lib/python3.8/_strptime.py", line 568, in _strptime_datetime
 tt, fraction, gmtoff_fraction = _strptime(data_string, format)
 File "/usr/lib/python3.8/_strptime.py", line 349, in _strptime
 raise ValueError("time data %r does not match format %r" %
ValueError: time data '32' does not match format '%Y'

This is a duplicate of bpo-13305 and is due to platform-specific implementations of %Y. On Linux, `strftime()` does not zero-pad to 4, and if you need to represent years <1000, you should use "%4Y" to zero-pad the output.
I think the ideal resolution would be a cross-platform implementation of strftime and strptime that does not rely on the system symbols, but that is a pretty large and overwhelming project.