自定义时区的 Java (GMT+00:00) 中没有时区偏移的 SimpleDateFormat [英] SimpleDateFormat without the Timezone Offset in Java (GMT+00:00) for Custom Timezone

问题描述

是否可以使用 SimpleDateFormat 类在 Java 中格式化日期时间以给出日期的时区部分，而后不带 +0000.

Is it possible to format a date time in Java using the SimpleDateFormat class to give the timezone part of a date without having the +0000 after it.

编辑

我们正在更改 Java 中的默认时区，如下所示:

We are changing the Default Timezone within Java as follows:

SimpleTimeZone tz = new SimpleTimeZone(0, "Out Timezone");        
TimeZone.setDefault(tz);

不幸的是，我无法删除此代码.我会冒险猜测整个系统停止工作.我认为最初的作者将其用于解决一些夏令时问题.

Unfortunately, I am in no position to remove this code. I would hazard a guess at the whole system stopping working. I think the initial author put this in to work around some day light saving issues.

考虑到这一点，我想将日期格式化为:

With this in mind, I want to format the date as:

2011-12-27 09:00 GMT

或

2011-12-27 09:00 BST

我只能让 SimpleDateFormat 输出为:

I can only get the SimpleDateFormat to output as:

2011-12-27 09:00:00 GMT+00:00

2011-12-27 09:00:00 GMT+00:00

使用格式字符串 yyyy-MM-dd HH:mm:ss z

我在任何地方都看不到简单时区引用了冬季时间 (GMT) id 或夏季时间 id (BST).

I cannot see anywhere where the simple timezone has any reference to winter time (GMT) id or summer time id (BST).

推荐答案

根本不是一个优雅的解决方案，但它对我们有用.我必须为 DateFormat/SimpleDateFormat 创建一个自定义实现.这看起来像下面这样:

Not an elegant solution at all but it works for us. I had to create a custom implementation for DateFormat/SimpleDateFormat. This looks like something as follows:

static {
    // this would be initialized like something as follows when the application starts
    // which causes the headaches of SimpleDateFormat not to work...
    SimpleTimeZone tz = new SimpleTimeZone(0, "Out Timezone");             
    TimeZone.setDefault(tz);  
}

// therefore this class will workaround the issue, 

public class OurOwnCustomDateFormat
    extends SimpleDateFormat {

    /** The pattern to use as the format string. */
    protected String pattern;

    public OurOwnCustomDateFormat(String pattern) {
         super(pattern);
         // store the pattern
         this.pattern = pattern;
    }

    @Override
    public StringBuffer format(Date date, StringBuffer toAppendTo, FieldPosition pos) {

         // custom implementation to format the date and time based on our TimeZone            
         toAppendTo.insert(pos.getBeginIndex(), "the date with our custom format calculated here");
         return toAppendTo; 
    }

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