Shift the time index, using the index’s frequency if available.
Deprecated since version 1.1.0: Use shift instead.
Number of periods to move, can be positive or negative.
Increment to use from the tseries module
or time rule expressed as a string (e.g. ‘EOM’).
Corresponds to the axis that contains the Index.
If freq is not specified then tries to use the freq or inferred_freq
attributes of the index. If neither of those attributes exist, a
ValueError is thrown