取出当天时间并减一，Java实现

Question

    Date date = new Date();
    String pattern = "yyyy-MM-dd";
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
    String today = simpleDateFormat.format(date);

如上代码 比如运行后得到2021-6-5
如何得到2021-6-4

Answer 1

Date yesterday= new Date(date.getTime()-86400000)