格林尼治标准时间转换日期时间字符串 [英] Convert GMT DateTime String
问题描述
我是pretty新的Java和我有点卡住使用的SimpleDateFormat
和日历
。我有约会对象,想提取GMT datestring像 YYYY-MM-DD HH:MM:SS
。我住在德国的那一刻,我们GMT +0200。我的约会对象的时间,例如 2011-07-18 13:00:00
。我现在需要的是 2011-07-18 11:00:00
。在我区偏移量应自动计算。
我想这样的事情,但我想有故障的地方:
私人字符串toGmtString(日期为准){
SimpleDateFormat的SD =新的SimpleDateFormat(YYYY-MM-DD HH:MM:SS);
时区的timeZone = TimeZone.getDefault();
日历CAL = Calendar.getInstance(新的SimpleTimeZone(timeZone.getOffset(date.getTime()),GMT));
sd.setCalendar(CAL);
返回sd.format(日期);
}
在某些设备就像我希望它返回datestring。在其他装置上的偏移不计算正确的,我接收来自输入日期对象的日期和时间。你能给我一些提示或建议?我想我的路要走获取默认时区不起作用?
私人字符串toGmtString(日期为准){
SimpleDateFormat的SD =新的SimpleDateFormat(YYYY-MM-DD HH:MM:SS);
sd.setTimeZone(TimeZone.getTimeZone(GMT));
返回sd.format(日期);
}
您并不需要创建一个新的的SimpleTimeZone
,因为你没有发明一种新的时区 - 有一些开始发挥作用,在你的程序2现有的时区,格林尼治标准时间和你的默认值。
您也不必修改现有的约会对象,因为你不想再present在不同的时间点 - 你只需要以不同的方式来显示在同一时间点。 p>
所有你需要做的是告诉的SimpleDateFormat
的格式要使用的时区。
I am pretty new to Java and I am a little stuck with using SimpleDateFormat
and Calendar
. I have a Date-Object and want to extract a GMT datestring like yyyy-MM-dd HH:mm:ss
. I live in Germany and at the moment we are GMT +0200. My Date-Object's time is for example 2011-07-18 13:00:00
. What I need now is 2011-07-18 11:00:00
. The offset for my timezone should be calculated automatically.
I tried something like this, but I guess there is a fault somewhere:
private String toGmtString(Date date){
SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
TimeZone timeZone = TimeZone.getDefault();
Calendar cal = Calendar.getInstance(new SimpleTimeZone(timeZone.getOffset(date.getTime()), "GMT"));
sd.setCalendar(cal);
return sd.format(date);
}
On some devices the datestring is returned like I want it to. On other devices the offset isn't calculated right and I receive the date and time from the input date-object. Can you give me some tips or advices? I guess my way off getting the default timezone does not work?
private String toGmtString(Date date){
SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sd.setTimeZone(TimeZone.getTimeZone("GMT"));
return sd.format(date);
}
You don't need to create a new SimpleTimeZone
, because you aren't inventing a new timezone - there are 2 existing timezones that come into play in your program, GMT and your default one.
You also don't need to modify your existing date object, because you don't want to represent a different point in time - you only want a different way to display the same point in time.
All you need to do is tell the SimpleDateFormat
which timezone to use in formatting.
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