在Java中将UTC转换为IST时间在LOCAL中有效，但在CLOUD SERVER中则无效 [英] Conversion of UTC to IST time in java is working in LOCAL but not in CLOUD SERVER

问题描述

我正在使用Java进行日期转换，因为我正在使用以下代码片段将UTC时间转换为IST格式。当我在本地运行它但在服务器中部署它而不转换时，它在本地正常工作，它只显示utc时间本身。服务器端是否需要任何配置。请帮帮我。

I am working in date conversion in java in that i am using following code snippet to convert the UTC time to IST format.It is working properly in the local when i run it but when i deploy it in server its not converting , its displaying only the utc time itself.Is there any configuaration is needed in server side.Please help me out.

代码片段：

   DateFormat sdf = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
    sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
    String pattern = "dd-MM-yyyy HH:mm:ss";
    SimpleDateFormat formatter;
    formatter = new SimpleDateFormat(pattern);

    try {
        String formattedDate = formatter.format(utcDate);
        Date ISTDate = sdf.parse(formattedDate);
String ISTDateString = formatter.format(ISTDate);
            return ISTDateString;
}

推荐答案

Java Date 对象已经/总是在UTC中。时区是在格式化文本时应用的内容。 Date 不能（应该！）不能位于UTC以外的任何时区。

Java Date objects are already/always in UTC. Time Zone is something that is applied when formatting to text. A Date cannot (should not!) be in any time zone other than UTC.

因此，整个概念将 utcDate 转换为 ISTDate 是有缺陷的。

（BTW：不好的名字。Java约定说现在应该是 istDate ）

So, the entire concept of converting utcDate to ISTDate is flawed.
(BTW: Bad name. Java conventions says it should be istDate)

现在，如果您希望代码将日期返回为IST时区中的文本，那么您需要请求：

Now, if you want the code to return the date as text in IST time zone, then you need to request that:

DateFormat formatter = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
formatter.setTimeZone(TimeZone.getTimeZone("Asia/Kolkata")); // Or whatever IST is supposed to be
return formatter.format(utcDate);

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