Dmitry Smolyaninov Dmitry Smolyaninov - 1 year ago 82
Android Question

Compare card expiry date in java. End of century?

I need to compare current date with the card expiry date in format

method. (I can't use Java 8 with its new Date processing classes).

To match years I use

So this works fine, but lets suppose my app will be in use in 2099, so card expiry date could turn into
so this value will be greater then current 2099 year, but the app will still think it's 2002.

What's the good practice to process this situation, if we don't know card validity terms and the format still

Thanks in advance for answer.

Answer Source

I found the solution in comparing not dates, but Strings lexicographically. You just need to compare year first, then months and impelent Comparator where 0 > 9.

public static boolean compareCardExpDateLexicographically(String dateToCompare) {
    SimpleDateFormat sdf = new SimpleDateFormat("yy/MM", Locale.US);
    Date date = new Date();
    String currentDate = sdf.format(date);
    String dateToComp = sdf.format((parseCardExpiryDate(dateToCompare)).getTime());

    Comparator<String> comp = new Comparator<String>() {
        public int compare(String o1, String o2) {

            if (o1.compareTo(o2) == 9) return -1;
            else if (o1.compareTo(o2) == -9) return 1;
            else if (o1.compareTo(o2) > 0) return 1;
            else if (o1.compareTo(o2) == 0) return 0;
            else return -1;

    return, currentDate) >= 0;
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