Dan,
as.Date() and as.POSIXct() have been updated to allow replacement of the hidden
functions .POSIXct() and .Date() which were the only way to correctly convert
the numeric representation of the objects as Johannes explained. Given that
this is a very common operation (especially with POSIXct
Add my name to those who think this is a good change.
As someone who works daily with medical research data, the number of times I
have been
caugth by failure of statements like
as.Date(ifelse( is.na(prog.dt), lastfu.dt, prog.dt)
is a large annoyance. Replace ifelse by any number of selec
