get time difference of two timstamps, convert date format to a timestamp

get_time_difference.java

	private String getTimeDifference(String lastView) throws ParseException {
		
		Long curTimeInMill = System.currentTimeMillis();
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		format.setTimeZone(TimeZone.getTimeZone("UTC"));
		Date parsedDate = format.parse(lastView);
		Long lastViewInMillis = parsedDate.getTime();
		Log.d("lastView", lastView);
		Log.d("lastViewinMillis", String.valueOf(lastViewInMillis));
		long diff = curTimeInMill - lastViewInMillis;

		long diffSeconds = diff / 1000 % 60;
		long diffMinutes = diff / (60 * 1000) % 60;
		long diffHours = diff / (60 * 60 * 1000);
		long diffDays = diff / (24 * 60 * 60 * 1000);

		StringBuilder elapsedTime = new StringBuilder();

		if (diffDays != 0) {
			elapsedTime.append(String.valueOf(diffDays) + " Days" + " Ago");
		} else if (diffHours != 0) {
			elapsedTime.append(String.valueOf(diffHours) + " Hours" + " Ago");
		} else if (diffMinutes != 0) {
			elapsedTime.append(String.valueOf(diffMinutes) + " Minutes"
					+ " Ago");
		} else if (diffSeconds != 0) {
			elapsedTime.append(String.valueOf(diffSeconds) + " Seconds"
					+ " Ago");
		}
		Log.d("elapsedTime", elapsedTime.toString());
		return elapsedTime.toString();
	}