[R] How to convert European short dates to ISO format?

[Luigi Marongiu]

Hello,
I have been trying to convert European short dates formatted as
dd/mm/yy into the ISO 8601 but the function as.Dates interprets them
as American ones (mm/dd/yy), thus I get:

```
oriDates = c("23/01/20", "24/01/20", "25/01/20", "26/01/20",
"27/01/20", "28/01/20", "29/01/20", "30/01/20",
             "31/01/20", "01/02/20", "02/02/20", "03/02/20",
"04/02/20", "05/02/20", "06/02/20", "07/02/20")
isoDates = as.Date(oriDates, format = "%m/%d/%y")
> isoDates
 [1] NA           NA           NA           NA           NA
NA           NA
 [8] NA           NA           "2020-01-02" "2020-02-02" "2020-03-02"
"2020-04-02" "2020-05-02"
[15] "2020-06-02" "2020-07-02"
```

How can I convert properly?
-- 
Best regards,
Luigi