Java 从毫秒创建一个 GregorianCalendar 实例
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Creating a GregorianCalendar instance from milliseconds
提问by Amir Rachum
I have a certain time in milliseconds (in a Timestampobject) and I want to use it to create a GregorianCalendarobject. How can I do that?
我有一定的毫秒时间（在一个Timestamp对象中），我想用它来创建一个GregorianCalendar对象。我怎样才能做到这一点？
EDIT: How do I do the reverse?
编辑：我如何做相反的事情？
采纳答案by Michael Konietzka
Just get an instance of GregorianCalendar and setTime with your java.sql.Timestamp timestamp:
只需使用 java.sql.Timestamp 获取 GregorianCalendar 和 setTime 的实例timestamp：
Calendar cal=GregorianCalendar.getInstance();
cal.setTime(timestamp);
Edit:As peterhpointed out, GregorianCalendar.getInstance()will not provide a GregorianCalendarby default, because it is inherited fromCalendar.getInstance(), which can provide for example a BuddhistCalendaron some installations. To be sure to use a GregorianCalenderuse new GregorianCalendar()instead.
编辑：正如peterh 所指出GregorianCalendar.getInstance()的GregorianCalendar，默认情况下不会提供 a ，因为它是从 继承的Calendar.getInstance()，例如可以BuddhistCalendar在某些安装中提供 a 。一定要使用GregorianCalenderusenew GregorianCalendar()来代替。
回答by stark
I believe this works, although it may not be the best approach:
我相信这是有效的，尽管它可能不是最好的方法：
import java.sql.Date;
import java.sql.Timestamp;
import java.util.GregorianCalendar;
public class TimestampToGregorianCalendar {
/**
* @param args
*/
public static void main(String[] args) {
Timestamp t = new Timestamp(12356342); // replace with existing timestamp
Date d = new Date(t.getTime());
Calendar gregorianCalendar = GregorianCalendar.getInstance();
gregorianCalendar.setTime(d);
}
}
回答by aepryus
Timestamp timestamp = new Timestamp(23423434);
Calendar calendar = GregorianCalendar.getInstance();
calendar.setTimeInMillis(timestamp.getTime());
回答by haaduken
To get a GregorianCalendar object and not a Calendar object. Like Michael's answer provides, you can also do the following:
获取 GregorianCalendar 对象而不是 Calendar 对象。就像迈克尔的回答所提供的那样，您还可以执行以下操作：
long timestamp = 1234567890;
GregorianCalendar cal = new GregorianCalendar();
cal.setTimeInMillis(timestamp);
This assumes a UTC epoch timestamp.
这假定 UTC 纪元时间戳。
