Calculate age in Years, Months, Days, Hours, Minutes, and Seconds

Question

I need to take a birthday entered by the user (preferably in dd/mm//yyyy format) and find their age, based on todays date. Could someone explain to me the proce

Answer 1

public class Main {
    public static void main(String[] args) {
    LocalDateTime dateTime = LocalDateTime.of(2018, 12, 27, 11, 45, 0);
            Duration showSeconds = AgeCalculator.calculateAgeDuration(dateTime, LocalDateTime.now());
            TimeConverter.calculateTime(showSeconds.getSeconds());
    }
}

public class AgeCalculator {
    public static Duration calculateAgeDuration(LocalDateTime dayBefore, LocalDateTime currentDay) {
            return Duration.between(dayBefore, currentDay);
    }
}

public class TimeConverter {
    public static void calculateTime(long timeSeconds) {
        long days = timeSeconds / 86400; // 24*60*60
        long hours = timeSeconds / 3600;
        long minutes = (timeSeconds % 3600) / 60;
        long seconds = (timeSeconds % 3600) % 60;

        System.out.println("Days: " + days);
        System.out.println("Hours: " + hours);
        System.out.println("Minutes: " + minutes);
        System.out.println("Seconds: " + seconds);
    }
}

Days: 0 Hours: 4 Minutes: 30 Seconds: 29