function attachEventsListeners(){
    document.querySelector('input[id=daysBtn]').addEventListener('click', convertDays);
    document.querySelector('input[id=hoursBtn]').addEventListener('click', convertHours);
    document.querySelector('input[id=minutesBtn]').addEventListener('click', convertMinutes);
    document.querySelector('input[id=secondsBtn]').addEventListener('click', convertSeconds);

    function convertDays() {
        let days = document.querySelector('input[id=days]').value;
        document.querySelector('input[id=hours]').value = (days * 24).toString();
        document.querySelector('input[id=minutes]').value = (days * 1440).toString();
        document.querySelector('input[id=seconds]').value = (days * 86400).toString();
    }

    function convertHours() {
        let hours = document.querySelector('input[id=hours]').value;
        document.querySelector('input[id=days]').value = (hours / 24).toString();
        document.querySelector('input[id=minutes]').value = (hours * 60).toString();
        document.querySelector('input[id=seconds]').value = (hours * 3600).toString();
    }

    function convertMinutes() {
        let minutes = document.querySelector('input[id=minutes]').value;
        document.querySelector('input[id=days]').value = (minutes / 1440).toString();
        document.querySelector('input[id=hours]').value = (minutes / 60).toString();
        document.querySelector('input[id=seconds]').value = (minutes * 60).toString();
    }

    function convertSeconds() {
        let seconds = document.querySelector('input[id=seconds]').value;
        document.querySelector('input[id=days]').value = (seconds / 86400).toString();
        document.querySelector('input[id=hours]').value = (seconds / 3600).toString();
        document.querySelector('input[id=minutes]').value = (seconds / 60).toString();
    }
}