import pandas as pd
import matplotlib.pyplot as plt
data = pd.read_csv('dataset.csv')
data['sample_date'] = pd.to_datetime(data['sample_date'])
data['sample_date'].value_counts().sort_index().plot(kind='bar') # Use sort_index()
plt.tight_layout()
plt.show()
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solved FREQUENCY BAR CHART OF A DATE COLUMN IN AN ASCENDING ORDER OF DATES