[R] compute time span in months between two dates

Peter Dalgaard p.dalgaard at biostat.ku.dk
Mon Jul 2 18:59:35 CEST 2007

Aydemir, Zava (FID) wrote:
> Hi,
> I am just starting to play with R. What is the recommended manner for
> calculating time spans between 2 dates? In particular, should I be using
> the "chron" or the "date" package (so far I just found how to calculate
> a timespan in terms of days)?
> Thanks
I'd recommend something along these lines:

d1 <- "11/03-1959"
d2 <- "2/7-2007"
f <- "%d/%m-%Y"
as.numeric(as.Date(d2, f) - as.Date(d1, f), units="days")

(The format in f needs to be adjusted to the actual format, of course. 
For some formats, it can be omitted altogether).

> Zava
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