r - POSIXct back to character, specific format -

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lets have character vector of like: 

vec <- "1/1/2000"

at pont turn date via

newvec <- as.posixct("1/1/2000", format = "%d/%m/%y")

now let want make character again can do:

as.character(newvec) [1] "2000-01-01"

the new format y-m-d. how can turn newvec "1/1/2000" ?

like this:

as.character(newvec,'%d/%m/%y') # [1] "01/01/2000"

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