问在Android中如何计算两个时间戳之间的时间差

EN

 String posttime=1576917051506  
 String currenttime=ServerValue.TIMESTAMP

   long time1 = Long.valueof(posttime)
   long time2 = Long.valueof(currenttime)
   long diffrence  = time2-time1
   String myValue = convertSecondsToHMmSs(diffrence)

  public static String convertSecondsToHMmSs(long millis) {
       long seconds = (millis / 1000) % 60;
long minutes = (millis / (1000 * 60)) % 60;
long hours = millis / (1000 * 60 * 60);

StringBuilder b = new StringBuilder();
b.append(hours == 0 ? "00" : hours < 10 ? String.valueOf("0" + hours) : 
String.valueOf(hours));
b.append(":");
b.append(minutes == 0 ? "00" : minutes < 10 ? String.valueOf("0" + minutes) :     
String.valueOf(minutes));
b.append(":");
b.append(seconds == 0 ? "00" : seconds < 10 ? String.valueOf("0" + seconds) : 
String.valueOf(seconds));
return b.toString();
    }