proplot can't plot string like datetime

[singledoggy]

Description

proplot can't plot string like datetime

Steps to reproduce

A "Minimal, Complete and Verifiable Example" will make it much easier for maintainers to help you.

import pandas as pd
import numpy as np
start_date = '2023-01-01'
end_date = '2023-12-31'

dates = pd.date_range(start=start_date, end=end_date, freq='D')

data = np.random.randn(len(dates))

time_series = pd.Series(data, index=dates)

# proplot
import proplot as pplt
import matplotlib.pyplot as plt
fig, axs = pplt.subplots(ncols=1, nrows=1, figwidth=13, refaspect=4,)
time_series.plot(ax=axs)
axs.hlines(0.8, start_date, end_date)
plt.hlines(0.5, start_date, end_date)
axs.format(
    suptitle='', xlabel='xlabel', ylabel='ylabel', abc=True,
)

# %%
# matplotlib
fig, axs = plt.subplots()
time_series.plot(ax=axs)
axs.hlines(0.8, start_date, end_date)
plt.hlines(0.5, start_date, end_date)
axs.format(
    suptitle='', xlabel='xlabel', ylabel='ylabel', abc=True,
)

Expected behavior: [What you expected to happen]

Actual behavior: [What actually happened]

Equivalent steps in matplotlib

Please try to make sure this bug is related to a proplot-specific feature. If you're not sure, try to replicate it with the native matplotlib API. Matplotlib bugs belong on the matplotlib github page.

See the code above.

Proplot version

Paste the results of import matplotlib; print(matplotlib.__version__); import proplot; print(proplot.version) here.
3.4.3
0.9.5.post360

How to quick fix

start_date = np.datetime64('2022-01-01')
end_date = np.datetime64('2023-12-31')

Proplot is capable of accepting datetime formats other than string formats. However, if it does not support accepting string inputs as datetimes, it would be advisable to raise a warning to avoid confusion among users.