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PR summary
Added code to test_datetime.py in order to test Axes.triplot as requested in #26864
Based on my testing, it seems that the triplot function does not support the datetime type, therefore I had to first convert it using date2num() to plot it correctly.
I'm new to this repository and GitHub open source contributions in general, I would appreciate if you provide feedback or if you have any suggestions on how I should proceed.
The outputted graph can be seen below:

PR checklist