java get localdate tim from long code example

Example 1: get long from date java

String string_date = "12-December-2012";

SimpleDateFormat f = new SimpleDateFormat("dd-MMM-yyyy");
try {
    Date d = f.parse(string_date);
    long milliseconds = d.getTime();
} catch (ParseException e) {
    e.printStackTrace();
}

Example 2: java convert LocalDateTime to long

public long createTimestamp() {
        ZoneId zoneId = ZoneId.systemDefault();
        return LocalDateTime.now().atZone(zoneId).toEpochSecond();
    }