[R] Splitting row in function of time

[PEL]

Hello all,

I have a data frame that looks like this:

http://r.789695.n4.nabble.com/file/n4077622/Capture.png 

I would like to know if it's possible to split a single row into two rows
when the time frame between "beg" and "end" overlaps midnight. I want to
compare the frequency of each activity for each day so a row for a phase
that overlaps on two dates unbalances the graphs I create with this data.

Ex:
>From the original row:

http://r.789695.n4.nabble.com/file/n4077622/Capture2.png 

Note: "phasetime" is only a difftime between "end" and "beg".
          "phaseno" and "activity" should stay the same for the two new
lines.

Here is a sample of my data that covers a few days:
http://r.789695.n4.nabble.com/file/n4077622/example.txt example.txt 

Thank you to anyone who takes the time to read this and any idea will be
welcome

PEL

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