I am having trouble with what must be a very simple problem. Here is a reproducible example:

library(lubridate)
st <- c("1961-01","1961-04","1983-02")
print(st)
#[1] "1961-01" "1961-04" "1983-02"
st1 <- as.Date(st, format=("%Y-%m"))
print(st1)
#[1] NA NA NA

Why the heck am I getting three NAs instead of three Dates?I have studied the R documentation for as.Date() and it has not turned on the light bulb for me.

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