[R] Separators in strptime---needed?

[John Kane]

For some reason I  thought that I could read some text into dates without a separator?  Am I wrong?

Examples

Works,  it appears
ccc <- c("2011-04-07", "1989-10-12")
x <- strptime(ccc, "%Y-%m-%d")

Does not work
ddd <- c("20110407", "19891012")
y <- strptime(ccc, "%Y%m%d")

Does this mean I would have to parse the data in ddd and add separators? 
Or am I missing some option in the help on strptime?

Thanks