Seaborn/Matplotlib Date Axis barplot minor-major tick formatting

https://github.com/mwaskom/seaborn/issues/498

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ax.xaxis.set_major_locator(matplotlib.dates.DayLocator(interval=2))

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matplotlib/seaborn heatmap using pandas dataframe with datetime index

plt.xticks(rotation=45)
axHM = sns.heatmap(df.T, cmap='coolwarm', xticklabels=df.index.strftime('%H:%M'))

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Matplotlib Subplot Datetime X-Axis Ticks Not Working As Intended