Uneven Line Diagram Plotting And Change Of Date Format

I have two strange issue from the pandas plot. Below is the sample data I am working on which is a data set of three pressure values. I just want to plot these values as line diagr

Solution 1:

Use the parameter dayfirst=True for pd.read_csv

df = pd.read_csv(data_path, index_col=0, parse_dates=True, dayfirst=True)
df1 = df[['D1', 'D2', 'D3']]
plt1 = df1.plot(marker='o', figsize=(16, 9), title=title, grid=True)