[Python] Formatting datetime xlabels in matplotlib (pandas df.plot() method)

I can't figure out how to change the format of these x-labels. Ideally, I'd like to call strftime('%Y-%m-%d') on them. I've tried things like set_major_formatter but was unsuccessful.

import pandas as pd
import numpy as np
date_range = pd.date_range('2014-01-01', '2015-01-01', freq='MS')
df = pd.DataFrame({'foo': np.random.randint(0, 10, len(date_range))}, index=date_range)
ax = df.plot(kind='bar')




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