时间日期的转换

来源：互联网发布：java 流程图框架编辑：程序博客网时间：2024/05/17 21:50

毫秒，日期之间的转换

(1)毫秒转换为日期

public static void main(String[] args) {        long a = Long.parseLong("135707832866");        Date date = new Date(a);        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        System.err.println(dateFormat.format(date));    }

public static void main(String[] args) {      DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");      long now = System.currentTimeMillis();      Calendar calendar = Calendar.getInstance();      calendar.setTimeInMillis(now);      System.out.println(now + " = " + formatter.format(calendar.getTime()));}

(2) 日期转换为毫秒两个日期想减得到天数

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        String start = "2011-09-20 12:30:45";        String end = "2011-10-20 6:30:00";        try {            // 得到毫秒数            long timeStart = sdf.parse(start).getTime();            long timeEnd = sdf.parse(end).getTime();            // 两个日期想减得到天数            long dayCount = (timeEnd - timeStart) / (24 * 3600 * 1000);            System.out.println(dayCount);        } catch (ParseException e) {            e.printStackTrace();}