how to change format of date from string date

Question

I have date as a string like this

String date = \"11-12-2018\"

I want to change it to \"2018-12-11\"

with the same var

Answer 1

This is the common function which I use for date and time conversion

public String convertDateAndTime(String date, String oldFormat, String newFormat) {
        SimpleDateFormat sdf = new SimpleDateFormat(oldFormat);
        Date currentdate;
        String converted = "";
        try {
            currentdate = sdf.parse(date);
            SimpleDateFormat sdf2 = new SimpleDateFormat(newFormat);
            converted = sdf2.format(currentdate);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return converted;
    }

You just have to pass the date string and their old and new formats. In your case call this function like this

String converteddate = convertDateAndTime("11-12-2018","dd-mm-yyyy","yyyy-MM-dd");