好使的时间戳

/**
     * 将一个时间戳转换成提示性时间字符串，如刚刚，1秒前
     *
     * @param timeStamp
     * @return
     */
    public static String convertTimeToFormat(long timeStamp) {
        long time = (System.currentTimeMillis() - timeStamp) / (long) 1000;

        if (time < 60 && time >= 0) {
            return "刚刚";
        } else if (time >= 60 && time < 3600) {
            return time / 60 + "分钟前";
        } else if (time >= 3600 && time < 3600 * 24) {
            return time / 3600 + "小时前";
        } else if (time >= 3600 * 24 && time < 3600 * 24 * 30) {
            return time / 3600 / 24 + "天前";
        } else if (time >= 3600 * 24 * 30 && time < 3600 * 24 * 30 * 12) {
            return time / 3600 / 24 / 30 + "个月前";
        } else if (time >= 3600 * 24 * 30 * 12) {
            return time / 3600 / 24 / 30 / 12 + "年前";
        } else {
            return "刚刚";
        }
    }

public class DateUtil {

    /**
     * 将一个时间戳转换成提示性时间字符串，如刚刚，1秒前
     */
    public static String convertTimeToFormat(String timeStamp) {
        long curTime =System.currentTimeMillis()/1000 ;
        long time = curTime - Long.parseLong(timeStamp);
        if (time < 60 && time >= 0) {
            return "刚刚";
        } else if (time >= 60 && time < 3600) {
            return time / 60 + "分钟前";
        } else if (time >= 3600 && time < 3600 * 24) {
            return time / 3600 + "小时前";
        } else if (time >= 3600 * 24 && time < 3600 * 24 * 30) {
            return time / 3600 / 24 + "天前";
        } else if (time >= 3600 * 24 * 30 && time < 3600 * 24 * 30 * 12) {
            return time / 3600 / 24 / 30 + "个月前";
        } else if (time >= 3600 * 24 * 30 * 12) {
            return time / 3600 / 24 / 30 / 12 + "年前";
        }else {
            return curTime+"-"+Long.parseLong(timeStamp)*1000+"-"+time+"";
        }

    }

    /**
     * 时间戳转化为日期格式字符串
     */
    public static String timeStampToDate(String seconds, String format) {
        if(seconds == null || seconds.isEmpty() || seconds.equals("null")){
            return "";
        }
        if(format == null || format.isEmpty()) format = "yyyy-MM-dd HH:mm:ss";
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        return sdf.format(new Date(Long.valueOf(seconds+"000")));
    }
    /**
     * 日期格式字符串转换成时间戳
     */
    public static String dateToTimeStamp(String date_str, String format){
        try {
            SimpleDateFormat sdf = new SimpleDateFormat(format);
            return String.valueOf(sdf.parse(date_str).getTime()/1000);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

    /**
     * 取得当前时间戳（精确到秒）
     * @return
     */
    public static String timeStamp(){
        long time = System.currentTimeMillis();
        String t = String.valueOf(time/1000);
        return t;
    }

    /**
     * 取得指定日期时间戳（精确到秒）
     * @return
     */
    public static String timeStamp1(String s) throws ParseException {
        long time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(s).getTime();
        String t = String.valueOf(time/1000);
        return t;
    }

/**
 * 根据日期计算周几
 *
 * @param strParams
 * @return
 */
public static String caculateWeeks(String strParams) {
    String Week = "";
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    Calendar c = Calendar.getInstance();
    try {
        c.setTime(format.parse(strParams));
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    if (c.get(Calendar.DAY_OF_WEEK) == 1) {
        Week += "天";
    }
    if (c.get(Calendar.DAY_OF_WEEK) == 2) {
        Week += "一";
    }
    if (c.get(Calendar.DAY_OF_WEEK) == 3) {
        Week += "二";
    }
    if (c.get(Calendar.DAY_OF_WEEK) == 4) {
        Week += "三";
    }
    if (c.get(Calendar.DAY_OF_WEEK) == 5) {
        Week += "四";
    }
    if (c.get(Calendar.DAY_OF_WEEK) == 6) {
        Week += "五";
    }
    if (c.get(Calendar.DAY_OF_WEEK) == 7) {
        Week += "六";
    }
    return Week;
}

}

在Activity用法：

public class Main3Activity extends Activity {
    private TextView tv1,tv2,tv3;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        tv1= (TextView) findViewById(R.id.textView1);
        tv2= (TextView) findViewById(R.id.textView2);
        tv3= (TextView) findViewById(R.id.textView3);
        try {
            String timeStamp = DateUtil.timeStamp1("2010-12-25 11:54:00");
            tv1.setText(DateUtil.timeStampToDate(timeStamp, "yyyy-MM-dd HH:mm:ss"));
            tv2.setText(timeStamp+"=="+DateUtil.dateToTimeStamp(DateUtil.timeStampToDate(timeStamp, "yyyy-MM-dd HH:mm:ss"), "yyyy-MM-dd HH:mm:ss"));
            tv3.setText(DateUtil.convertTimeToFormat(timeStamp));
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}