ax.fmt_xdata 是日期格式，通常仅用于交互式绘图中的悬停功能.

ax.fmt_xdata is the formatter for the dates usually only used for the hover functionality in interactive plots.

您要在此处将xaxis的主要格式化程序设置为 DateFormatter :

What you want here is to set the major formatter of the xaxis to a DateFormatter:

ax.xaxis.set_major_formatter(DateFormatter('%b-%d-%Y'))