matplotlib.axes.Axes.yaxis_date
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Axes.yaxis_date(tz=None) - 
Sets up y-axis ticks and labels that treat the y data as dates.
Parameters: - 
tz : string or tzinfo instance, optional - 
Timezone string or timezone. Defaults to rc value.
 
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    https://matplotlib.org/3.0.0/api/_as_gen/matplotlib.axes.Axes.yaxis_date.html