[R] How to extract an interval of "hour:minute" type

[ikuzar]

Jim Holtman > I'd like to compare "hour1:min1:sec1" with "hour2:min2:sec2".  
I know how to do to compare "year1-mon1-day1 hour1:min1:sec1" with
"year2-mon2-day2 hour2:min2:sec2" by converting 'character' into POSIXlt 

but

I'd like to konw if there is another way to do this comparison without
converting my POSIXLT column into 'character' .
If possible, I want to work with DateTime format and not with string so that
I do not make new conversions



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