def _add_delta(self, delta):
if isinstance(delta, (Tick, timedelta)):
inc = offsets._delta_to_microseconds(delta)
new_values = (self.asi8 + inc).view("M8[us]")
else:
new_values = self.astype("O") + delta
return DatetimeIndex(new_values, tz=self.tz, freq="infer")
def _get_range_edges(axis, begin, end, offset, closed='left',
base=0):
from pandas.tseries.offsets import Tick, _delta_to_microseconds
if isinstance(offset, basestring):
offset = to_offset(offset)
if not isinstance(offset, DateOffset):
raise ValueError("Rule not a recognized offset")
if isinstance(offset, Tick):
day_micros = _delta_to_microseconds(timedelta(1))
# #1165
if ((day_micros % offset.micros) == 0 and begin is None
and end is None):
return _adjust_dates_anchored(axis[0], axis[-1], offset,
closed=closed, base=base)
if begin is None:
if closed == 'left':
first = Timestamp(offset.rollback(axis[0]))
else:
first = Timestamp(axis[0] - offset)
else:
first = Timestamp(offset.rollback(begin))
if end is None:
last = Timestamp(axis[-1] + offset)
else:
last = Timestamp(offset.rollforward(end))
return first, last
