Time

Timestream.shift_by	Return a Timestream shifting each point forward by the delta.
Timestream.shift_to	Return a Timestream shifting each point forward to time.
Timestream.shift_until	Return a Timestream shifting each point forward to the next time predicate is true.
Timestream.time	Return a Timestream containing the time of each point.
Timestream.seconds_since	Return a Timestream containing seconds between time and self.
Timestream.seconds_since_previous	Return a Timestream containing seconds between self and the time n points ago.