About python matplotlib x-axis date format setting

Question

About matplotlib x-axis date format setting Hello everyone: I am learning to write a crawler program in python Stock information obtained through the yfinance package Use matplotlib to draw line graphs But the date format of the axis drawn by matplotlib Is e.g. 03 Nov 2021, not the matplotlib date format I want

I hope that the date format of the x-axis drawn by matplotlib can be changed Change to the format of yyyy-mm-dd, I hope everyone can help

my code:

import yfinance as yf
import matplotlib.pyplot as plt
import pandas as pd
from matplotlib.dates import DateFormatter as mdates
startday = '2021-11-03'
endday = '2021-11-12'
ticker_list = ['2303.TW','2610.TW','2618.TW']
data = pd.DataFrame(columns=ticker_list)
for ticker in ticker_list:
     data[ticker] = yf.download(ticker, startday,endday)['Adj Close'] #Get the closing price of the stock market on that day
ans=data.head()
#Start drawing
data.plot(figsize=(8,12))
plt.legend()
plt.rcParams['font.sans-serif'] = ['Microsoft JhengHei']
plt.rcParams['axes.unicode_minus'] = False
plt.title("Line chart change of 7-day closing price of stock market", fontsize=16)
plt.ylabel('closing price', fontsize=14)
plt.xlabel('Day', fontsize=14)
plt.grid(which="major", color='k', linestyle='-.', linewidth=0.5)
plt.show()
print(ans)

The result of this answer is that the scale on the x-axis is not from 2021, did you solve the problem? — r-beginners
– r-beginners, Commented Nov 13, 2021 at 12:32

mechanical_meat · Accepted Answer · 2021-11-13 03:54:51Z

You need both a locator and formatter. Reference: https://matplotlib.org/stable/gallery/text_labels_and_annotations/date.html And the way you imported mdates isn't how it's usually done, so I've adjusted that too.

# ... other imports
import matplotlib.dates as mdates
 
startday = '2021-11-03' 
endday = '2021-11-12' 
ticker_list = ['2303.TW','2610.TW','2618.TW'] 
data = pd.DataFrame(columns=ticker_list) 
for ticker in ticker_list: 
    data[ticker] = yf.download(ticker, startday,endday)['Adj Close']
    ans=data.head()  
    data.plot(figsize=(8,12)) 
    plt.legend() 
    plt.rcParams['font.sans-serif'] = ['Microsoft JhengHei'] 
    plt.rcParams['axes.unicode_minus'] = False 
    plt.title("Line chart change of 7-day closing price of stock market", 
              fontsize=16) 
    plt.ylabel('closing price', fontsize=14) 
    plt.xlabel('Day', fontsize=14) 
    plt.grid(which="major", color='k', linestyle='-.', linewidth=0.5) 
    fmt_day = mdates.DayLocator() # provides a list of days 
    plt.gca().xaxis.set_major_locator(fmt_day) 
    plt.gca().xaxis.set_major_formatter(mdates.DateFormatter("%Y-%m-%d")) 
    plt.show()

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