I am trying to customize xticks, but they are completely ignored by python and I can’t figure out why.

import pandas as pd
from matplotlib import pyplot as plt
import shutil
import subprocess
from datetime import datetime
import matplotlib.dates as mdates

df = pd.read_csv('/var/www/cioffi/wp-content/uploads/2023/11/output.csv',index_col=0, parse_dates=[0])

plt = df.plot(y="P_1_1_2_Tot_1", ylabel="mm", kind="line", title="Precipitazioni", grid=1, figsize=(8,4),xlabel="",rot=90,legend=False)

plt.xaxis.set_major_locator(mdates.DayLocator(interval=2)) 
plt.xaxis.set_major_formatter(mdates.DateFormatter('%d-%m'))

plt.figure.savefig('/opt/script/cioffi/precipitazioni.png', dpi=150 ,bbox_inches="tight")
shutil.move('/opt/script/cioffi/precipitazioni.png','/var/www/cioffi/wp-content/uploads/2024/04/precipitazioni.png')

They are automatically overwritten in this way:
https://i.sstatic.net/LhOz4H6d.png

plt.xaxis.set_major_locator(mdates.DayLocator(interval=2)) 

is ignored, and I would like it to be every 2 days

plt.xaxis.set_major_formatter(mdates.DateFormatter('%d-%m'))

is ignored, and I would like the day and month to be written for every ticks.