Showing Morning, afternoon, evening, night message based on Time in java

Question

What i am trying to do::

Show message based on

• Good morning (12am-12pm)
• Good after noon (12pm -4pm)
• Good evening

Answer 1

 private String getStringFromMilli(long millis) {

    Calendar c = Calendar.getInstance();
    c.setTimeInMillis(millis);
    int hours = c.get(Calendar.HOUR_OF_DAY);

    if(hours >= 1 && hours <= 12){
        return "MORNING";
    }else if(hours >= 12 && hours <= 16){
        return "AFTERNOON";
    }else if(hours >= 16 && hours <= 21){
        return "EVENING";
    }else if(hours >= 21 && hours <= 24){
        return "NIGHT";
    }
    return null;
}