[R] Intersect, Union of date/time ranges

[Nathan S. Watson-Haigh]

I have 2 sets of data which defines the start and end of date/time 
periods. I want to be able to obtain the following:

1) The intersect of those 2 sets of date/time ranges i.e. return 
start/end date/time ranges where both sets overlap
2) The union of those 2 sets of date/time ranges i.e. return the 
start/end date/time ranges which are in 1 or both sets

Is there anything that is currently able to do this? If not, I'll start 
to code something.

Kind regards,
Nathan

-- 
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Dr. Nathan S. Watson-Haigh
OCE Post Doctoral Fellow
CSIRO Livestock Industries
University Drive
Townsville, QLD 4810
Australia

Tel: +61 (0)7 4753 8548
Fax: +61 (0)7 4753 8600
Web: http://www.csiro.au/people/Nathan.Watson-Haigh.html