Control POSIX time difference output in R

问题

In R I have two strings:

t <- c("2010-01-01 00:01:02", "2010-01-01 00:02:02")

which I convert to POSIX datetimes:

dt <- as.POSIXct(t)

Taking the difference of the two dt[2] - dt[1] gives:

Time difference of 1 mins

Cool. But how do I force the time difference to be in, say, seconds?

回答1:

> difftime(dt[2], dt[1], units="secs")
Time difference of 60 secs

来源：https://stackoverflow.com/questions/7492247/control-posix-time-difference-output-in-r