Question

User should enter date in the next format yyyy-MM-dd. So I check it on my side using:

public static boolean isDateValid(SimpleDateFormat dateFormat, String date) {
    try {
        dateFormat.parse(date);
        return true;
    } catch (ParseException e) {
        e.printStackTrace();
        return false;
    }
}

But it returns true even I enter 12-12-2012 for the

SimpleDateFormat("yyyy-MM-dd")

Answer 1

You can use DateFormat.setLenient(false), to avoid doing lenient parsing: –

    try {
        dateFormat.setLenient(false);
        dateFormat.parse(date);
        return true;
    } catch (ParseException e) {
        e.printStackTrace();
        return false;
    }

From the docs: –

With lenient parsing, the parser may use heuristics to interpret
inputs that do not precisely match this object’s format. With strict
parsing, inputs must match this object’s format.