fig,ax=plt.subplots(layout="constrained")x_dates1=np.array(    [datetime.datetime(2020,6,30),datetime.datetime(2020,7,22),datetime.datetime(2020,8,3),datetime.datetime(2020,9,14),],dtype=np.datetime64)np.random.seed(19680801)start_date=datetime.datetime(2020,7,1)end_date=datetime.datetime(2020,10,15)date_range=end_date-start_datedates1=start_date+np.random.rand(30)*date_rangedates2=start_date+np.random.rand(10)*date_rangedates3=start_date+np.random.rand(50)*date_rangecolors= ['C1','C2','C3']lineoffsets=np.array([datetime.datetime(2020,7,1),datetime.datetime(2020,7,15),datetime.datetime(2020,8,1)],dtype=np.datetime64)linelengths= [datetime.timedelta(days=5),datetime.timedelta(days=2),datetime.timedelta(days=3)]ax.eventplot([dates1,dates2,dates3],colors=colors,lineoffsets=lineoffsets,linelengths=linelengths)

Traceback (most recent call last):  File"/home/elliott/code/matplotlib/lib/matplotlib/axis.py", line1766, inconvert_units    ret=self.converter.convert(x,self.units,self)  File"/home/elliott/code/matplotlib/lib/matplotlib/dates.py", line1829, inconvertreturnself._get_converter().convert(*args,**kwargs)  File"/home/elliott/code/matplotlib/lib/matplotlib/dates.py", line1757, inconvertreturn date2num(value)  File"/home/elliott/code/matplotlib/lib/matplotlib/dates.py", line449, indate2num    d= d.astype('datetime64[us]')ValueError:Could not convert object to NumPy datetimeThe above exception was the direct cause of the following exception:Traceback (most recent call last):  File"/home/elliott/code/matplotlib/foo.py", line31, in<module>    ax.eventplot([dates1, dates2, dates3],colors=colors,  File"/home/elliott/code/matplotlib/lib/matplotlib/__init__.py", line1472, ininnerreturn func(  File"/home/elliott/code/matplotlib/lib/matplotlib/axes/_axes.py", line1353, ineventplot    lineoffsets, linelengths=self._process_unit_info(  File"/home/elliott/code/matplotlib/lib/matplotlib/axes/_base.py", line2566, in_process_unit_inforeturn [axis_map[axis_name].convert_units(data)  File"/home/elliott/code/matplotlib/lib/matplotlib/axes/_base.py", line2566, in<listcomp>return [axis_map[axis_name].convert_units(data)  File"/home/elliott/code/matplotlib/lib/matplotlib/axis.py", line1768, inconvert_unitsraise munits.ConversionError('Failed to convert value(s) to axis'matplotlib.units.ConversionError:Failed to convert value(s) to axis units: [datetime.timedelta(days=5), datetime.timedelta(days=2), datetime.timedelta(days=3)]