Question

我在系统时区创建的日历对象是＆＃34; EDT＆＃34;。当我得到cal.getTime();时，它会打印出EDT的日期。如何以UTC格式获取相同日历的日期？

我只是想使用以下代码段将其转换为字符串

   `Calendar cal = Calendar.getInstance();      
    String definedDate = CalendarUtils.toString(cal, "MM/dd/yyyy");
    System.out.println(definedDate); 


public static String toString(Calendar cal, String pattern) {
    String str = "";
    if (cal!= null) {
        SimpleDateFormat dateFormat = new SimpleDateFormat(pattern);
        str = dateFormat.format(cal.getTime());
        LOGGER.error("Date : "+str);
    }
    return str;
}

`

Answer 1

尝试下面的代码，将DateFormat的时区设置为DateFormat.setTimeZone（）：

TimeZone timeZone = TimeZone.getTimeZone("UTC");
Calendar calendar = Calendar.getInstance(timeZone);
SimpleDateFormat simpleDateFormat = 
       new SimpleDateFormat("EE MMM dd HH:mm:ss zzz yyyy", Locale.US);
simpleDateFormat.setTimeZone(timeZone);

System.out.println("Time zone: " + timeZone.getID());
System.out.println("default time zone: " + TimeZone.getDefault().getID());
System.out.println();

System.out.println("UTC:     " + simpleDateFormat.format(calendar.getTime()));
System.out.println("Default: " + calendar.getTime());

Answer 2

使用以下代码段获取日历实例...

Calendar cal= Calendar.getInstance(TimeZone.getTimeZone("UTC"));

或者将时区更改为utc，如下所示......

cal.setTimeZone(TimeZone.getTimeZone("UTC"));

Answer 3

Calendar c2 = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
c2.set(year, month, date, hourOfDay, minute, second);
System.out.println(sdf.format(c2.getTime()));

将默认时区转换为UTC

3 个答案: