import pandas as pd
date = pd.date_range('2021-1-1', '2021-11-30', freq='15d')
print(date)		
		
		

		
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt

df = pd.DataFrame(np.random.randn(15, 4), index=pd.date_range(
    '2021/01/01', periods=15), columns=list('ABCD'))

df.plot()
plt.show()