Hi everybody,
I have an analysis problem that seems a little overwhelming to me, but is
probably not too hard to solve for you guys. I have a (fairly large)
dataframe that indicates usage of a resource on different days:

df <-data.frame (
  dstartday =c(rep('2012-02-10', 4), rep('2012-02-11', 5)),
  dstart =c('08:05:00','09:35:00', '12:00:00','13:00:00', '07:50:00',
'9:45:00', '13:00:00', '14:05:00', '15:50:00'),
  dendday =c (rep('2012-02-10', 3), '2012-02-11',rep('2012-02-12', 5)),
  dend = c ('08:35:00','09:40:00', '12:20:00', '01:00:00', '08:35:00',
'11:00:00', '13:15:00', '15:00:00', '17:00:00')
)

Each row reflects an event that starts at the date and time that is
indicated by dstartday/dstart and ends at dendday/dend.
Now I would like to calculate the time intervals in minutes between the
different events that start on a specific day, eg for '2012-02-10' it
should be 60, 140, 40. The interval between the last event of the day and
the first event of the next is not relevant and should be ignored. Events
may run overnight, but there should not be any overlaps between start and
end times.
I have imported all the data as strings.
Any thoughts and suggested readings/packages are really appreciated, thanks!

Best,

Kai

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