问题

我正在创建一个社交应用，希望在有人上传帖子时保存帖子的日期和时间。我希望将其保存为类似于`dd-MM-yyyy HH:mm:ss`的格式。目前它的显示方式如下图所示：

![当前日期和时间戳][1]

以下是我在一个方法中的代码：

```java
public static String getTimeDate(long timestamp){
    try{
        Date netDate = (new Date(timestamp));
        SimpleDateFormat sfd = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss", Locale.getDefault());
        return sfd.format(netDate);
    } catch(Exception e) {
        return "日期";
    }
}

我希望它能以我想要的格式保存上传帖子的日期和时间。但是我的问题是如何在 Firebase 数据库中正确上传它。以下是我上传当前字段的方式：

HashMap<String, Object> hashMap = new HashMap<>();
hashMap.put("postid", postid);
hashMap.put("postimage", myUrl);
hashMap.put("description", description.getText().toString());
hashMap.put("publisher", FirebaseAuth.getInstance().getCurrentUser().getUid());

我试图上传时间戳，如下所示：

hashMap.put("date_time", getTimeDate(timestamp));

但是当我悬停在getTimeDate()旁边的括号上时，它显示期望 1 个参数，但找到 0 个参数，所以我猜我必须使用字符串而不是方法名。有人可以帮我解决该问题吗？

<details>
<summary>英文:</summary>

I am creating a social app and I want to save the date and time of a post when someone uploads it. I want it to be saved for example as `dd-MM-yyyy HH:mm:ss`. Currently this is how it looks 

![Current date and time stamp][1]


  [1]: https://i.stack.imgur.com/a1nVs.png

So this is the code that I have in a method.

    public static String getTimeDate(long timestamp){
        try{
            Date netDate = (new Date(timestamp));
            SimpleDateFormat sfd = new SimpleDateFormat(&quot;dd-MM-yyyy HH:mm:ss&quot;, Locale.getDefault());
            return sfd.format(netDate);
        } catch(Exception e) {
            return &quot;date&quot;;
        }
    }

I expect it to save the date and time that the post was uploaded in the format I want. But my problem is uploading it correctly in the Firebase DB. This is how I am uploading my current fields.

    HashMap&lt;String, Object&gt; hashMap = new HashMap&lt;&gt;();
    hashMap.put(&quot;postid&quot;, postid);
    hashMap.put(&quot;postimage&quot;, myUrl);
    hashMap.put(&quot;description&quot;, description.getText().toString());
    hashMap.put(&quot;publisher&quot;, FirebaseAuth.getInstance().getCurrentUser().getUid());

I am trying to upload the timestamp like:

    hashMap.put(&quot;date_time&quot;, getTimeDate() );

But when I hover over the parenthesis next to `getTimeDate()` it says `Expected 1 arguments but found 0`
so I&#39;m guessing I have to use a string instead of the method name. Can someone help me on what to do ?

</details>


# 答案1
**得分**: 0

以下是翻译好的内容：

获取数据上传时的当前时间，您可以使用`new Date()`，并且在不需要参数的情况下更改您的方法。

```java
public static String getTimeDate() { // 不需要参数
    try{
        Date netDate = new Date(); // 从这里获取当前时间
        SimpleDateFormat sfd = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss", Locale.getDefault());
        return sfd.format(netDate);
    } catch(Exception e) {
        return "日期";
    }
}

public static String getTimeDate() { // without parameter argument
    try{
        Date netDate = new Date(); // current time from here
        SimpleDateFormat sfd = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss", Locale.getDefault());
        return sfd.format(netDate);
    } catch(Exception e) {
        return "date";
    }
}