The help page for as.POSIXlt suggests using it as a way to extract month, day,
and year.
However, I can't find any documentation on the results and am a bit surprised by the month
portion.
An example, run about 6:21 AM on Sept 3.
> unlist(unclass(as.POSIXlt(Sys.time())))
sec min hour mday mon year wday yday
43.24545 21.00000 6.00000 3.00000 8.00000 113.00000 2.00000 245.00000
isdst
1.00000
So: it appears that I need to
add 1900 to year
add 1 to month
but other components are as I would expect.
> unlist(unclass(as.POSIXlt(as.Date("1953/03/10"))))
sec min hour mday mon year wday yday isdst
0 0 0 10 2 53 2 68 0
Supports a 0 origin for everything except year and mday.
A pointer to formal documentation of this would make me feel easier about using the
function.
Terry Therneau
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