問題描述

在嘗試轉換日期格式時出現異常:無法解析的日期并且不知道如何解決此問題.

While trying to transform the date format I get an exception:unparseable date and don't know how to fix this problem.

我收到一個代表事件日期的字符串，并希望在 GUI 中以不同的格式顯示該日期.

I am receiving a string which represents an event date and would like to display this date in different format in GUI.

我想要做的是:

private String modifyDateLayout(String inputDate){
        try {
            //inputDate = "2010-01-04 01:32:27 UTC";
            Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss z").parse(inputDate);
            return new SimpleDateFormat("dd.MM.yyyy HH:mm:ss").format(date);
        } catch (ParseException e) {
            e.printStackTrace();
            return "15.01.2010";
        }
    }

不管怎樣

String modifiedDateString = originalDate.toString();

是假的.我想獲取以下格式的日期字符串:

is dummy. I would like to get a date string in the following format:

dd.MM.yyyy HH:mm:ss

dd.MM.yyyy HH:mm:ss

輸入字符串示例如下:

2010-01-04 01:32:27 UTC

2010-01-04 01:32:27 UTC

有誰知道如何將上面的示例日期(字符串)轉換為字符串格式dd.MM.yyyy HH:mm:ss?

Does anyone know how to convert the example date (String) above into a String format dd.MM.yyyy HH:mm:ss?

謝謝！

我修復了錯誤的輸入日期格式，但仍然無法正常工作.上面是粘貼的方法，下面是調試會話的屏幕圖像.

I fixed the wrong input date format but still it doesn't work. Above is the pasted method and below is the screen image from debugging session.

替代文字 http://img683.imageshack.us/img683/193/dateproblem.png

#更新我跑了

String[] timezones = TimeZone.getAvailableIDs();

并且數組中有UTC字符串.這是一個奇怪的問題.

and there is UTC String in the array. It's a strange problem.

我做了一個有效的骯臟黑客:

I did a dirty hack that works:

private String modifyDateLayout(String inputDate){
    try {
        inputDate = inputDate.replace(" UTC", "");
        Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(inputDate);
        return new SimpleDateFormat("dd.MM.yyyy HH:mm:ss").format(date);
    } catch (ParseException e) {
        e.printStackTrace();
        return "15.01.2010";
    }
}

但我仍然希望在不削減時區的情況下轉換原始輸入.

But still I would prefer to transform the original input without cutting timezone away.

此代碼是為使用 JDK 1.6 的 Android 手機編寫的.

This code is written for Android phone using JDK 1.6.

推薦答案

你在這里基本上做的是依賴 Date#toString() 已經有一個固定的模式.要將 Java Date 對象轉換為另一種人類可讀的字符串模式，您需要 SimpleDateFormat#format().

What you're basically doing here is relying on Date#toString() which already has a fixed pattern. To convert a Java Date object into another human readable String pattern, you need SimpleDateFormat#format().

private String modifyDateLayout(String inputDate) throws ParseException{
    Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss z").parse(inputDate);
    return new SimpleDateFormat("dd.MM.yyyy HH:mm:ss").format(date);
}

順便說一下，這里只能由 SimpleDateFormat#parse().這意味著 inputDate 不在預期的模式 "yyyy-MM-dd HH:mm:ss z" 中.您可能需要修改模式以匹配 inputDate 的實際模式.

By the way, the "unparseable date" exception can here only be thrown by SimpleDateFormat#parse(). This means that the inputDate isn't in the expected pattern "yyyy-MM-dd HH:mm:ss z". You'll probably need to modify the pattern to match the inputDate's actual pattern.

更新:好的，我做了一個測試:

Update: Okay, I did a test:

public static void main(String[] args) throws Exception {
    String inputDate = "2010-01-04 01:32:27 UTC";
    String newDate = new Test().modifyDateLayout(inputDate);
    System.out.println(newDate);
}

這正確打印:

03.01.2010 21:32:27

(我在 GMT-4)

更新 2: 根據您的編輯，您確實得到了一個 ParseException.最可疑的部分將是 UTC 的時區.這在您的 Java 環境中實際上是已知嗎?您使用的是什么 Java 版本和什么操作系統版本?檢查 TimeZone.getAvailableIDs().中間必須有一個UTC.

Update 2: as per your edit, you really got a ParseException on that. The most suspicious part would then be the timezone of UTC. Is this actually known at your Java environment? What Java version and what OS version are you using? Check TimeZone.getAvailableIDs(). There must be a UTC in between.

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