[Python] Python ValueError: ':' is a bad directive in format '%Y-%m-%d%X%:z'

I'm attempting to parse HTML time strings in Python:

from datetime import datetime

input = "2025-03-24T07:01:53+00:00"
output = datetime.strptime(input, "%Y-%m-%d%X%:z")
print(output)


Running this with Python 3.13 returns the following error:

Traceback (most recent call last):
File "/Users/dread_pirate_roberts/html_time_converter/main.py", line 69, in <module>
output = datetime.strptime(input, "%Y-%m-%d%X%:z")
File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/_strptime.py", line 674, in _strptime_datetime
tt, fraction, gmtoff_fraction = _strptime(data_string, format)
~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/_strptime.py", line 445, in _strptime
raise ValueError("'%s' is a bad directive in format '%s'" %
(bad_directive, format)) from None
ValueError: ':' is a bad directive in format '%Y-%m-%d%X%:z'


This doesn't make sense to me because %:z was added in Python 3.12.

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