Time data does not match format

[maciekkrysz]

Is there any option to handle datetime with this format?
"time data 2021-12-02T14:15:13.277878+00:00 does not match format yyyy-mm-ddThh:mm:ss(\\.s+)?Z"

I got this saml response generated by flask-saml2 library
<saml:Conditions NotBefore="2021-11-22T13:50:36.332054+00:00" NotOnOrAfter="2021-11-22T14:08:36.332054+00:00">

[pitbulk]

Format of accepted datetimes are defined at:
https://github.com/onelogin/python3-saml/blob/master/src/onelogin/saml2/utils.py#L69

[pitbulk]

Hi @akx

I saw your commit akx@e0241ab

Can you include it in a way that we reuse the compat.py file and we use calendar when available so we don't break compatibility with python 2.7?