Utility (getPostTime)

import android.util.Log;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

/**
 * Created by rachmadi on 4/13/17.
 */

public class Utility {

    String TAG = "Utility";

    public String getPostTime(long timeStamp){

        String postTime = "";
        Date dLastDate = null;

        TimeZone timezone = TimeZone.getDefault();
        DateFormat objFormatter = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
        objFormatter.setTimeZone(timezone);

        Calendar objCalendar = Calendar.getInstance(timezone);
        objCalendar.setTimeInMillis(timeStamp);
        String result = objFormatter.format(objCalendar.getTime());
        objCalendar.clear();

        String datePost = result;

        SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss", Locale.getDefault());
        String dateCurrent = dateFormat.format(new Date());

        //HH converts hour in 24 hours format (0-23), day calculation
        SimpleDateFormat format = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss", Locale.getDefault());

        Date d1 = null;
        Date d2 = null;

        try {
            d1 = format.parse(datePost);
            d2 = format.parse(dateCurrent);

            //in milliseconds
            long diff = d2.getTime() - d1.getTime();

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

            String firstDate = datePost.substring(0, 10);
            String secondDate = dateCurrent.substring(0, 10);

            if (!firstDate.equals(secondDate)) {
                SimpleDateFormat lastDateDf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
                dLastDate = lastDateDf.parse(result);
                SimpleDateFormat dLastDateDf = new SimpleDateFormat("dd MMM yy, HH:mm");
                postTime = dLastDateDf.format(dLastDate);
            }
            else if (diffDays < 1) {
                if (diffHours > 0){
                    postTime = String.valueOf(diffHours) + " jam lalu";
                } else if (diffMinutes > 0){
                    postTime = String.valueOf(diffMinutes) + " menit lalu";
                } else if (diffSeconds > 0){
                    postTime = String.valueOf(diffSeconds) + " detik lalu";
                } else if (diffDays == 0) {
                    postTime = "1 detik lalu";
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
            Log.d(TAG, "error: " + e.toString());
        }

        return postTime;
    }

}