JAVA：gmt 到本地时间的转换
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JAVA: gmt to local time conversion
提问by DJ'
I am developing a software in java.
我正在用java开发一个软件。
I get a timestamp in GMT from a server. The software can be used anywhere in the world. Now I want to get the local time zone where the software is running and convert this GMT time to the local time.
我从服务器获得了格林威治标准时间的时间戳。该软件可以在世界任何地方使用。现在我想获取运行软件的本地时区并将此 GMT 时间转换为本地时间。
Please tell me how to do this?
请告诉我如何做到这一点？
采纳答案by Raveesh Sharma
To get your local timezone :
要获取您的本地时区：
Calendar.getInstance().getTimeZone().getDisplayName()
Calendar.getInstance().getTimeZone().getDisplayName()
For the conversion:
对于转换：
回答by Tomasz Nurkiewicz
Assuming your timestampis either a Dateor Number:
假设您timestamp是 aDate或Number：
final DateFormat formatter = DateFormat.getDateTimeInstance();
formatter.setTimeZone(TimeZone.getTimeZone("America/New_York"));
System.out.println(formatter.format(timestamp));
If your timestamp is given as a String, you first have to parse it. You'll find plenty of examples with custom format in SimpleDateFormat, a simple example with built-in format:
如果您的时间戳以 a 形式给出String，则您首先必须对其进行解析。您会在 中找到大量带有自定义格式的示例SimpleDateFormat，一个带有内置格式的简单示例：
final DateFormat formatter = DateFormat.getDateTimeInstance();
formatter.setTimeZone(TimeZone.getTimeZone("GMT"));
final Date timezone = formatter.parse("2012-04-14 14:23:34");
formatter.setTimeZone(TimeZone.getTimeZone("America/New_York"));
System.out.println(formatter.format(timezone));
回答by rsinha
Assuming the server time in format yyyy/MM/dd HH:mm:ss.SSSthis works:
假设服务器时间格式yyyy/MM/dd HH:mm:ss.SSS如下：
String serverTime = "2017/12/06 21:04:07.406"; // GMT
ZonedDateTime gmtTime = LocalDateTime.parse(serverTime, DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss.SSS")).atZone(ZoneId.of("GMT"));
LocalDateTime localTime = gmtTime.withZoneSameInstant(ZoneId.systemDefault()).toLocalDateTime();
回答by Wim Deblauwe
Have a look at Joda-Time. It has all the date related functions one needs
看看乔达时间。它具有您需要的所有日期相关功能
