Update plot.py

[tomthepeach]

Removed depreciated/unnecessary datetime conversion

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[tcuongd]

Could you please provide some example plots from your branch to validate that the functionality is still working as intended, thanks!

[tomthepeach]

[tomthepeach]

This is using my fork built locally in a venv

[tomthepeach]

This solves issue #2492

[tomthepeach]

@tcuongd Ok to merge?

[tcuongd]

Thanks for this and sorry for the long review lag.