java 关于日期的记录

1、日期相减

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");Date now = null;Date date = null;try {    now = df.parse("2004-03-26 13:31:34");    date=df.parse("2004-01-02 11:30:53");    long l=now.getTime()-date.getTime();    long day=l/(24*60*60*1000);    long hour=(l/(60*60*1000)-day*24);    long min=((l/(60*1000))-day*24*60-hour*60);    long s=(l/1000-day*24*60*60-hour*60*60-min*60);    Log.d("=========", day + "天" + hour + "小时" + min + "分" + s + "秒");} catch (ParseException e) {    e.printStackTrace();}

2、日期转字符串

Date date = new Date();SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd E HH:mm:ss");String time = sdf.format(date);Log.d("=====", time);

3、字符串转日期

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");Date date = null;try {    date = sdf.parse( "2008-07-10 19:20:00" );} catch (ParseException e) {    e.printStackTrace();}Calendar c = Calendar.getInstance();c.setTime(date);int i = c.get(Calendar.YEAR);Log.d("=======",i+"");