matplotlib.axes.Axes.yaxis_date

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