从当前日期减去两天，在历史毫秒java [英] subtracting two days from current date in epoch milliseconds java

问题描述

我正在努力做一些非常简单的事情。我试图从当天减去2天。我从UI中获取了几个小时。所以在这个例子中，我从用户界面48小时。我在做以下事情，我不知道我在这里做错了什么。我认为这样做的结果是从时间上减去几分钟。

  long timeInEpoch =（currentMillis（）/ 1000  - （48 * 60 * 60））; // 48来自UI 
 
 public long currentMillis（）{
 return new Date（）。getTime（）; 
} 
 
 d = new Date（timeInEpoch * 1000）; 
  

我也尝试过

  d1 = new Date（timeInEpoch）; 
  

没有什么可以工作。我在这里做错什么？

解决方案

尝试

  long millis = System.currentTimeMillis（） -  2 * 24 * 60 * 60 * 1000; 
 Date date = new Date（millis）; 
  

它绝对有效

I am trying to do something really simple. I am trying to subtract 2 days from the current day. I get the number of hours from the UI. So in this example, I get 48 hours from the UI. I am doing the following and I don't know what i'm doing wrong here. I think the result of this is it only subtracts a few minutes from the time.

long timeInEpoch = (currentMillis()/1000 - (48 * 60 * 60)); //48 comes from UI

public long currentMillis(){
    return new Date().getTime();
}

d = new Date(timeInEpoch * 1000);

I also tried

d1 = new Date(timeInEpoch);

Nothing seems to work. What am I doing wrong here?

解决方案

try

    long millis = System.currentTimeMillis() - 2 * 24 * 60 * 60 * 1000; 
    Date date = new Date(millis);

it definitely works

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