Get Date Difference

public static String getDateDifference(Date thenDate){
        Calendar now = Calendar.getInstance();
        Calendar then = Calendar.getInstance();
        now.setTime(new Date());
        then.setTime(thenDate);

     
        // Get the represented date in milliseconds
        long nowMs = now.getTimeInMillis();
        long thenMs = then.getTimeInMillis();
     
        // Calculate difference in milliseconds
        long diff = nowMs - thenMs;
     
        // Calculate difference in seconds
        long diffMinutes = diff / (60 * 1000);
        long diffHours = diff / (60 * 60 * 1000);
        long diffDays = diff / (24 * 60 * 60 * 1000);

  if (diffMinutes<60){
   if (diffMinutes==1)
    return diffMinutes + " minute ago";
   else
    return diffMinutes + " minutes ago";
  } else if (diffHours<24){
   if (diffHours==1)
    return diffHours + " hour ago";
   else
    return diffHours + " hours ago";
  }else if (diffDays<30){
   if (diffDays==1)
    return diffDays + " day ago";
   else
    return diffDays + " days ago";
  }else {
   return "a long time ago..";
  }
 }

//// get day difference
=============

Time date1 = initializeDate1(); //get the date from somewhere
Time date2 = initializeDate2(); //get the date from somewhere

long millis1 = date1.toMillis(true);
long millis2 = date2.toMillis(true);

long difference = millis2 - millis1 ;

//now get the days from the difference and that's it
long days = TimeUnit.MILLISECONDS.toDays(difference);

//now you can do something like
if(days == 7)
{
    //do whatever when there's a week of difference
}

if(days >= 30)
{
    //do whatever when it's been a month or more
}