时间格式转换

1、年月日时分秒转时间戳

    private static long getTimeMillis(String time) {
        try {
            DateFormat dateFormat = new SimpleDateFormat("yy-MM-dd HH:mm:ss");
            DateFormat dayFormat = new SimpleDateFormat("yy-MM-dd");
            Date date = dateFormat.parse(dayFormat.format(new Date()) + " " + time);
            return date.getTime();
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return 0;
    }

2、时间戳转年月日时分秒

    private static String getTime(long timeMills) {
        SimpleDateFormat dateFormat = new SimpleDateFormat("yy-MM-dd HH:mm:ss");
        return dateFormat.format(new Date(timeMills));
    }

log输出

    public static void main(String[] args) {
        System.out.println("time= " + getTimeMillis("15:00:00"));
        System.out.println("timeMills= " + getTime(1667458800000L));
    }

time= 1667458800000
timeMills= 22-11-03 15:00:00