Java 如何在Android中设置用于字符串解析的时区
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How to set the TimeZone for String parsing in Android
提问by Vlad
I try to parse a String and set a time zone, but I can't produce the desired result.
我尝试解析字符串并设置时区，但无法产生所需的结果。
String dtc = "2014-04-02T07:59:02.111Z";
SimpleDateFormat readDate = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
Date date = null;
try {
date = readDate.parse(dtc);
Log.d("myLog", "date "+date);
} catch (ParseException e) {
Log.d("myLog", "dateExcep " + e);
}
SimpleDateFormat writeDate = new SimpleDateFormat("dd.MM.yyyy, HH.mm");
writeDate.setTimeZone(TimeZone.getTimeZone("GMT+04:00"));
String dateString = writeDate.format(date);
At the output of the variable "dateString" still gives the time 07:59:02 , and I want to make it +4 hours in advance that is 11:59:02
在变量“dateString”的输出中仍然给出时间 07:59:02 ，我想提前 4 小时，即 11:59:02
采纳答案by Meno Hochschild
You need to instruct the read-formatter to interprete the input as UTC (GMT - remember that Z stands for UTC in ISO-8601-format):
您需要指示读取格式化程序将输入解释为 UTC（GMT - 请记住 Z 代表 ISO-8601 格式的 UTC）：
String dtc = "2014-04-02T07:59:02.111Z";
SimpleDateFormat readDate = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
readDate.setTimeZone(TimeZone.getTimeZone("GMT")); // missing line
Date date = readDate.parse(dtc);
SimpleDateFormat writeDate = new SimpleDateFormat("dd.MM.yyyy, HH.mm");
writeDate.setTimeZone(TimeZone.getTimeZone("GMT+04:00"));
String s = writeDate.format(date);
Then you will get:
然后你会得到：
02.04.2014, 11.59
02.04.2014, 11.59
回答by Basil Bourque
Joda-Time
乔达时间
Doing date-time work much easier and simpler with the Joda-Timelibrary than with the notoriously troublesome bundled java.util.Date & .Calendar classes.
与臭名昭著的捆绑 java.util.Date 和 .Calendar 类相比，使用Joda-Time库更容易和更简单地完成日期时间工作。
Time Zone
时区
Using proper time zone names, rather than a specific offset, is generally a wiser approach.
使用正确的时区名称而不是特定的偏移量通常是一种更明智的方法。
Example Code
示例代码
Here is some example code using Joda-Time 2.3.
这是一些使用 Joda-Time 2.3 的示例代码。
Notice:
注意：
- Joda-Time has built-in parsers for strings in ISO 8601format. No need to instantiate parsing or formatting objects.
- Joda-Time is both parsing the UTC string andadjusting it to another time zone all in one call to the
DateTimeconstructor. - When converting to a UTC-based dateTime in the last line, we still have the same moment in the timeline of the Universe (same count of milliseconds since Unix epoch).
- Joda-Time 内置了ISO 8601格式的字符串解析器。无需实例化解析或格式化对象。
- Joda-Time 正在解析 UTC 字符串并将其调整到另一个时区，所有这些都在对
DateTime构造函数的一次调用中。 - 当在最后一行转换为基于 UTC 的 dateTime 时，我们在宇宙的时间线中仍然具有相同的时刻（自Unix epoch以来的毫秒数相同）。
Source…
来源…
String input = "2014-04-02T07:59:02.111Z";
DateTimeZone timeZone = DateTimeZone.forID( "Asia/Dubai" );
DateTime dateTimeDubai = new DateTime( input, timeZone ); (a) Parse, (b) Adjust time zone.
DateTime dateTimeUtc = dateTimeDubai.withZone( DateTimeZone.UTC );
Dump to console…
转储到控制台...
System.out.println( "input: " + input );
System.out.println( "dateTimeDubai: " + dateTimeDubai );
System.out.println( "dateTimeUtc: " + dateTimeUtc );
When run…
运行时…
input: 2014-04-02T07:59:02.111Z
dateTimeDubai: 2014-04-02T11:59:02.111+04:00
dateTimeUtc: 2014-04-02T07:59:02.111Z
回答by shabnam singh
you can take whatever pattern you want like i have date+ time zone. so you can set according to you. here is my code.
你可以采用任何你想要的模式，就像我有日期+时区一样。所以你可以根据你的设置。这是我的代码。
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
here i have set the date format.
在这里我设置了日期格式。
String currentDate = dateFormat.format(currentLocalTime);
String localTime = date.format(currentLocalTime);// to get the time zone i have used this.
String newtime=currentDate+localTime;// and then i have apeend this now print log you will get the desire result.
