如何在matplotlib中更改19:00-7:00时间段的图表刻度标签

import matplotlib.pyplot as plt
import matplotlib.dates as mdates

fig, ax = plt.subplots()

# 假设时间段为一天的数据
x = [datetime.datetime(2022, 1, 1, hour=i) for i in range(24)]
y = [i for i in range(24)]

ax.xaxis.set_major_locator(mdates.HourLocator(interval=1))
ax.xaxis.set_major_formatter(mdates.DateFormatter('%H:%M'))

# 获取x轴刻度标签
xticks = ax.get_xticks()

# 将19:00-7:00时间段的刻度标签替换为对应的时间
xticks = [xtick.replace(hour=19) if xtick.hour < 7 else xtick for xtick in xticks]

# 设置x轴刻度标签
ax.set_xticklabels(xticks)

ax.plot(x, y)
plt.show()