DateOperations.java

public final class DateOperations {
    /**
     * Gets the Epoch seconds of the given LocalDateTime
     * @return long of the seconds since the beginning of time (for Java)
     */
    public static long getLocalSeconds(LocalDateTime localDateTime) {
        ZoneId zone = ZoneId.systemDefault();
        ZonedDateTime zdt = localDateTime.atZone(zone);
        return zdt.toEpochSecond();
    }
}