See:
?DateTimeClasses
?as.POSIXct
?strptime
?difftime
The example for difftime should help:
(z <- Sys.time() - 3600)
Sys.time() - z # just over 3600 seconds.
## time interval between releases of 1.2.2 and 1.2.3.
ISOdate(2001, 4, 26) - ISOdate(2001, 2, 26)
as.difftime(c("0:3:20", "11:23:15"))
as.difftime(c("3:20", "23:15", "2:"), format= "%H:%M")# 3rd gives NA
HTH, Andy
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