Bug summary

I am having the exact same issue as in #5248 (which apparently was resolved at some point, but it's not working for me) with the latest version of matplotlib as passing a list of datetime.dates to eventplot is not working.

Code for reproduction

`
import datetime
from matplotlib import pyplot as plt

ts_1 = [datetime.date(2021, 1, 15), datetime.date(2021, 1, 16), datetime.date(2021, 1, 18), datetime.date(2021, 1, 22), datetime.date(2021, 1, 26), datetime.date(2021, 1, 28), datetime.date(2021, 1, 30), datetime.date(2021, 2, 1), datetime.date(2021, 2, 3), datetime.date(2021, 2, 7), datetime.date(2021, 2, 8), datetime.date(2021, 2, 11), datetime.date(2021, 2, 15)]
ts_2 = [datetime.date(2021, 1, 1), datetime.date(2021, 1, 2), datetime.date(2021, 1, 3), datetime.date(2021, 1, 4), datetime.date(2021, 1, 5), datetime.date(2021, 1, 6), datetime.date(2021, 1, 7), datetime.date(2021, 1, 8), datetime.date(2021, 1, 9), datetime.date(2021, 1, 10), datetime.date(2021, 1, 11), datetime.date(2021, 1, 12), datetime.date(2021, 1, 13), datetime.date(2021, 1, 14), datetime.date(2021, 1, 15), datetime.date(2021, 1, 16), datetime.date(2021, 1, 17), datetime.date(2021, 1, 18), datetime.date(2021, 1, 19), datetime.date(2021, 1, 20), datetime.date(2021, 1, 25), datetime.date(2021, 1, 26), datetime.date(2021, 1, 27), datetime.date(2021, 1, 28), datetime.date(2021, 1, 29), datetime.date(2021, 1, 30), datetime.date(2021, 1, 31), datetime.date(2021, 2, 12)]
plt.eventplot([ts_1, ts_2])
`

Actual outcome

TypeError Traceback (most recent call last)
~\AppData\Local\Temp/ipykernel_6840/2408848598.py in
4 ts_1 = [datetime.date(2021, 1, 15), datetime.date(2021, 1, 16), datetime.date(2021, 1, 18), datetime.date(2021, 1, 22), datetime.date(2021, 1, 26), datetime.date(2021, 1, 28), datetime.date(2021, 1, 30), datetime.date(2021, 2, 1), datetime.date(2021, 2, 3), datetime.date(2021, 2, 7), datetime.date(2021, 2, 8), datetime.date(2021, 2, 11), datetime.date(2021, 2, 15)]
5 ts_2 = [datetime.date(2021, 1, 1), datetime.date(2021, 1, 2), datetime.date(2021, 1, 3), datetime.date(2021, 1, 4), datetime.date(2021, 1, 5), datetime.date(2021, 1, 6), datetime.date(2021, 1, 7), datetime.date(2021, 1, 8), datetime.date(2021, 1, 9), datetime.date(2021, 1, 10), datetime.date(2021, 1, 11), datetime.date(2021, 1, 12), datetime.date(2021, 1, 13), datetime.date(2021, 1, 14), datetime.date(2021, 1, 15), datetime.date(2021, 1, 16), datetime.date(2021, 1, 17), datetime.date(2021, 1, 18), datetime.date(2021, 1, 19), datetime.date(2021, 1, 20), datetime.date(2021, 1, 25), datetime.date(2021, 1, 26), datetime.date(2021, 1, 27), datetime.date(2021, 1, 28), datetime.date(2021, 1, 29), datetime.date(2021, 1, 30), datetime.date(2021, 1, 31), datetime.date(2021, 2, 12)]
----> 6 plt.eventplot([ts_1, ts_2], colors="black")

c:\Users\User\Documents\venv\lib\site-packages\matplotlib\pyplot.py in eventplot(positions, orientation, lineoffsets, linelengths, linewidths, colors, linestyles, data, **kwargs)
2784 linelengths=1, linewidths=None, colors=None,
2785 linestyles='solid', *, data=None, **kwargs):
-> 2786 return gca().eventplot(
2787 positions, orientation=orientation, lineoffsets=lineoffsets,
2788 linelengths=linelengths, linewidths=linewidths, colors=colors,

c:\Users\User\Documents\venv\lib\site-packages\matplotlib_init_.py in inner(ax, data, *args, **kwargs)
1359 def inner(ax, *args, data=None, **kwargs):
1360 if data is None:
-> 1361 return func(ax, *map(sanitize_sequence, args), **kwargs)
1362
1363 bound = new_sig.bind(ax, *args, **kwargs)

c:\Users\User\Documents\venv\lib\site-packages\matplotlib\axes_axes.py in eventplot(self, positions, orientation, lineoffsets, linelengths, linewidths, colors, linestyles, **kwargs)
1321 zip(positions, lineoffsets, linelengths, linewidths,
1322 colors, linestyles):
-> 1323 coll = mcoll.EventCollection(position,
1324 orientation=orientation,
1325 lineoffset=lineoffset,

c:\Users\User\Documents\venv\lib\site-packages\matplotlib\collections.py in init(self, positions, orientation, lineoffset, linelength, linewidth, color, linestyle, antialiased, **kwargs)
1619 self._lineoffset = lineoffset
1620 self.set_orientation(orientation)
-> 1621 self.set_positions(positions)
1622
1623 def get_positions(self):

c:\Users\User\Documents\venv\lib\site-packages\matplotlib\collections.py in set_positions(self, positions)
1638 pos_idx = 0 if self.is_horizontal() else 1
1639 segments = np.empty((len(positions), 2, 2))
-> 1640 segments[:, :, pos_idx] = np.sort(positions)[:, None]
1641 segments[:, 0, 1 - pos_idx] = lineoffset + linelength / 2
1642 segments[:, 1, 1 - pos_idx] = lineoffset - linelength / 2

TypeError: float() argument must be a string or a number, not 'datetime.date'

Expected outcome

An eventplot with one time series per "row" in the y-axis.

Operating system

Windows

Matplotlib Version

3.4.3

Matplotlib Backend

No response

Python version

3.9.7

Jupyter version

No response

Other libraries

No response

Installation

pip

Conda channel

No response