R - how to convert numeric to date in r

#Return "2021-01-20 20:11:59" as yyyy-mm-dd format
as_date("2021-01-20 20:11:59")

#> [1] "2021-01-20"

df <- data.frame(lapply(df, function(x) as.Date(as.character(x), "%Y%m%d")))

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