Java 8及更高版本的更新
您现在可以简单地做Instant.parse("2015-04-28T14:23:38.521Z")
并得到正确的结果,特别是在最新版本的Java中,您应该使用Instant
而不是不完整的java.util.Date
.
你应该使用DateTimeFormatter
而不是SimpleDateFormatter
.
原始答案:
就格式所代表的内容而言,下面的解释仍然有效.
This works with the input with the trailing Z
as demonstrated:
在这个模式中,T
的两边各有'
个.
如文档所示,最后Z
的模式实际上是XXX
在SimpleDateFormat
的JavaDoc中,只是不太清楚
关于如何实际使用它,因为Z
是旧的标志
TimeZone
个信息.
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;
public class Q2597083
{
/**
* All Dates are normalized to UTC, it is up the client code to convert to the appropriate TimeZone.
*/
public static final TimeZone UTC;
/**
* @see <a href="http://en.wikipedia.org/wiki/ISO_8601#Combined_date_and_time_representations">Combined Date and Time Representations</a>
*/
public static final String ISO_8601_24H_FULL_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSSXXX";
/**
* 0001-01-01T00:00:00.000Z
*/
public static final Date BEGINNING_OF_TIME;
/**
* 292278994-08-17T07:12:55.807Z
*/
public static final Date END_OF_TIME;
static
{
UTC = TimeZone.getTimeZone("UTC");
TimeZone.setDefault(UTC);
final Calendar c = new GregorianCalendar(UTC);
c.set(1, 0, 1, 0, 0, 0);
c.set(Calendar.MILLISECOND, 0);
BEGINNING_OF_TIME = c.getTime();
c.setTime(new Date(Long.MAX_VALUE));
END_OF_TIME = c.getTime();
}
public static void main(String[] args) throws Exception
{
final SimpleDateFormat sdf = new SimpleDateFormat(ISO_8601_24H_FULL_FORMAT);
sdf.setTimeZone(UTC);
System.out.println("sdf.format(BEGINNING_OF_TIME) = " + sdf.format(BEGINNING_OF_TIME));
System.out.println("sdf.format(END_OF_TIME) = " + sdf.format(END_OF_TIME));
System.out.println("sdf.format(new Date()) = " + sdf.format(new Date()));
System.out.println("sdf.parse(\"2015-04-28T14:23:38.521Z\") = " + sdf.parse("2015-04-28T14:23:38.521Z"));
System.out.println("sdf.parse(\"0001-01-01T00:00:00.000Z\") = " + sdf.parse("0001-01-01T00:00:00.000Z"));
System.out.println("sdf.parse(\"292278994-08-17T07:12:55.807Z\") = " + sdf.parse("292278994-08-17T07:12:55.807Z"));
}
}
生成以下输出:
sdf.format(BEGINNING_OF_TIME) = 0001-01-01T00:00:00.000Z
sdf.format(END_OF_TIME) = 292278994-08-17T07:12:55.807Z
sdf.format(new Date()) = 2015-04-28T14:38:25.956Z
sdf.parse("2015-04-28T14:23:38.521Z") = Tue Apr 28 14:23:38 UTC 2015
sdf.parse("0001-01-01T00:00:00.000Z") = Sat Jan 01 00:00:00 UTC 1
sdf.parse("292278994-08-17T07:12:55.807Z") = Sun Aug 17 07:12:55 UTC 292278994