Change the year in a datetime object in R?

Question

I have the following:

\"0014-06-30\"

And I\'d like to change it to:

\"0000-06-30\"

How would I do this in

Answer 1

I couldn't get the specific format by converting to as.Date. A regex option would be

str1 <- "0014-06-30"
as.Date(str1)
#[1] "14-06-30"

sub('\\d{2}(?=-)', '00', str1, perl=TRUE)
#[1] "0000-06-30"