Java将秒换算成天、时、分、秒格式

public class Time {
public static String formatDateTime(long mss) {
String DateTimes = null;
long days = mss / ( 60 * 60 * 24);
long hours = (mss % ( 60 * 60 * 24)) / (60 * 60);
long minutes = (mss % ( 60 * 60)) /60;
long seconds = mss % 60;
if(days>0){
DateTimes= days + “天” + hours + “小时” + minutes + “分钟”
+ seconds + “秒”;
}else if(hours>0){
DateTimes=hours + “小时” + minutes + “分钟”
+ seconds + “秒”;
}else if(minutes>0){
DateTimes=minutes + “分钟”
+ seconds + “秒”;
}else{
DateTimes=seconds + “秒”;
}

return DateTimes;
}

public static void main(String[] args) {
long mss=17551;
String ss= Time.formatDateTime(mss);
System.out.println(ss);
}
}