Time converter utility that converts date object into smaller and relative time stamps like 2s, 2m, 4h and so on.

RelativeTimeStamp.java

package com.dbws.fk.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * Created by ayush on 14/9/15.
 */
public class RelativeTimeStamp {

    /**
     * converts date object into relative time stamp like 1s, 1m, 1h, 1d..6d, date
     *
     * @param date
     * @return relative timestamp
     */
    public static String getRelativeTimeStamp(Date date) {
        String relative_time_stamp = "";

        long orginal_time = date.getTime();
        long current_time_stamp = Calendar.getInstance().getTimeInMillis();

        long diff = current_time_stamp - orginal_time;

        if (diff < (60 * 1000)) { // if less than 60s
            relative_time_stamp = String.valueOf(diff / 1000) + "s"; // 1s
        } else if (diff < (60 * 60 * 1000)) { // if less than 60 min
            relative_time_stamp = String.valueOf(diff / (60 * 1000)) + "m"; // 2m
        } else if (diff < (24 * 60 * 60 * 1000)) { // if less than 24 hours
            relative_time_stamp = String.valueOf(diff / (60 * 60 * 1000)) + "h";
        } else if (diff < (7 * 24 * 60 * 60 * 1000)) { // if less than 7 days
            relative_time_stamp = String.valueOf(diff / (24 * 60 * 60 * 1000)) + "d";
        } else { // if more than 7 days .. return human readable date 
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("d MMM ''yy");
            relative_time_stamp = simpleDateFormat.format(date);
        }

        return relative_time_stamp;
    }

    /**
     * Converts default date time stamp into Date object
     *
     * @param datetime
     * @return date
     */
    public static Date getDateObject(String datetime) {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date = null;
        try {
            date = simpleDateFormat.parse(datetime);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return date;
    }

}