使用Java将当前GMT时间转换为CST时区 [英] Convert current GMT time into CST timezone using java

问题描述

我正在尝试使用JDK8将当前GMT时间转换为CST时间.但是我的代码对于两个时区总是返回相同的时间.我还验证了getAvailableIDs()具有"CST".

I am trying to convert current GMT time to CST time using JDK8. But my code always returns the same time for both the timezones. I also verified getAvailableIDs() has "CST".

                Calendar cal = Calendar.getInstance();
            TimeZone timeZone = TimeZone.getTimeZone("GMT");
            cal.setTimeZone(timeZone);

            // System.out.println("GMT time = " + cal.getTime());

            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            sdf.setTimeZone(timeZone);
            String gmtDateStr = sdf.format(cal.getTime());
            System.out.println("Formatted GMT time = " + gmtDateStr);

            // To CST
            SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            TimeZone cst = TimeZone.getTimeZone("CST");
            sdf2.setTimeZone(cst);
            Date cstDate = sdf2.parse(gmtDateStr);

            // System.out.println("PARSED CST DATE = " + cstDate);

            Calendar cal2 = new GregorianCalendar();
            cal2.setTime(cstDate);
            cal2.setTimeZone(cst);
            String cstDateStr = sdf2.format(cal2.getTime());

            // System.out.println("cal2 time = " + cal2.getTime());
            System.out.println("FORMATTED CST DATE = " + cstDateStr);

这是怎么了?有人可以给我答案吗?

What is wrong here? Can any one provide me an answer?

推荐答案

您不必为了获得所需时区中的时间而进行所有转换.您只需执行以下操作即可.

You don't have to do all of this conversion to get time in your preferred timezone. You can simply do following..

        Calendar cal = Calendar.getInstance();
        TimeZone timeZone = TimeZone.getTimeZone("GMT");
        cal.setTimeZone(timeZone);

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        sdf.setTimeZone(timeZone);
        String gmtDateStr = sdf.format(cal.getTime());
        System.out.println("Formatted GMT time = " + gmtDateStr);

        // To CST
        SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        TimeZone cst = TimeZone.getTimeZone("CST");
        sdf2.setTimeZone(cst);

        System.out.println("FORMATTED CST DATE = " + sdf2.format(cal.getTime()));

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