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Gawain Bolton 2fabfad443 Improve performance of adding and subtracting time durations from a ptime. (#99) 
Modifying ptime objects by adding and subtracting time durations was
inefficient because it extracted the date and time of day and then
re-constructed a ptime using the date and modified time of day.

This can be avoided by using the existing time_system utilities which
perform the operation by adjusting the number of ticks.

Performance is improved by a factor of 48 on my system.
2019-10-10 13:07:48 -07:00
..
boost
Improve performance of adding and subtracting time durations from a ptime. (#99)
2019-10-10 13:07:48 -07:00