Android手机中取得当前时区（以GMT形式）

Android手机中如果想以GMT形式（GMT+08:00）得到当前时区，可以参照如下代码所示：

    public static String getCurrentTimeZone()
    {
        TimeZone tz = TimeZone.getDefault();
        return createGmtOffsetString(true,true,tz.getRawOffset());
    }
    public static String createGmtOffsetString(boolean includeGmt,
                                               boolean includeMinuteSeparator, int offsetMillis) {
        int offsetMinutes = offsetMillis / 60000;
        char sign = '+';
        if (offsetMinutes < 0) {
            sign = '-';
            offsetMinutes = -offsetMinutes;
        }
        StringBuilder builder = new StringBuilder(9);
        if (includeGmt) {
            builder.append("GMT");
        }
        builder.append(sign);
        appendNumber(builder, 2, offsetMinutes / 60);
        if (includeMinuteSeparator) {
            builder.append(':');
        }
        appendNumber(builder, 2, offsetMinutes % 60);
        return builder.toString();
    }

    private static void appendNumber(StringBuilder builder, int count, int value) {
        String string = Integer.toString(value);
        for (int i = 0; i < count - string.length(); i++) {
            builder.append('0');
        }
        builder.append(string);
    }

关于GMT和UTC的更多内容请参考 http://blog.csdn.net/hudashi/article/details/7069600