how to convert date string from csv file into date format [duplicate]

Answer 1

How about this:

as.Date("12/31/2000", format="%m/%d/%Y")

which yields a Date object, or:

d1 <- strptime("12/31/2000 17:35:17", format="%m/%d/%Y %H:%M:%S")
class(d1)
[1] "POSIXlt" "POSIXt"
d1
[1] "2000-12-31 17:35:17"