在java中将GMT转换为IST？

问题描述

我有一个GMT字段，其中用户输入要转换为IST的时间（例如：在小时字段18，分钟字段30，在会话字段am / pm中）。我需要获取这些输入并在java中转换为IST ???

I have a GMT field in which the user enter a time to be converted to IST (for eg: in hour field 18, minute field 30, in session field am/pm). I need to get those inputs and convert to IST in java???

推荐答案

如果你意识到这一点，这是非常容易和明显的时区仅与格式化为String的日期相关 - 秒/毫秒时间戳（其中 java.util.Date 仅仅是包装器）始终是隐式UTC（GMT是什么）适当地叫）。在这样的时间戳和字符串之间进行转换总是使用时区。

This is very easy and obvious if you realize that the timezone is only relevant for a date formatted as String - second/millisecond timestamps (of which java.util.Date is merely a wrapper) are always implicitly UTC (what GMT is properly called). And converting between such a timestamp and a string always uses a timezone, both ways.

所以这就是你需要做的事情：

So this is what you need to do:

    DateFormat utcFormat = new SimpleDateFormat(patternString);
    utcFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
    DateFormat indianFormat = new SimpleDateFormat(patternString);
    utcFormat.setTimeZone(TimeZone.getTimeZone("Asia/Kolkata"));
    Date timestamp = utcFormat.parse(inputString);
    String output = indianFormat.format(timestamp);

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