a : TimeSeries
TimeSeries object whose dates must be adjusted
start_date : Date, optional
New starting date. If not specified, the current starting date is used.
end_date : Date, optional
New ending date. If not specified, the current ending date is used.
copy : {False, True}, optional
Whether to return a copy of the initial array (True)
or a reference to the array (False), in the case where both
the start_date and end_date both fall into the initial range
of dates.
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