Java 如何在XMLGregorianCalendar中设置带区域的时间戳

我已使用此格式的DateTime

'2020-11-08T13:05:46.000-07:00'

并尝试将其设置为

xmlgoriiancalendar

。它会自动转换为

2020-11-08T20:05:46.000+0000

是否仍要将其保存为UTC？

tl；博士 java.time

XMLGregorianCalendar

是一个遗留类，多年前被

ZoneDateTime

取代

OffsetDateTime odt = OffsetDateTime.parse( "2020-11-08T13:05:46.000-07:00" ) ;

您的输入没有时区，只有与UTC的偏移量。因此，将该字符串解析为

OffsetDateTime

OffsetDateTime odt = OffsetDateTime.parse( "2020-11-08T13:05:46.000-07:00" ) ;

调整到UTC（零小时分秒的偏移量）的最简单方法是提取一个

瞬间

Instant instant = odt.toInstant() ;

---

您可以按如下方式进行操作：

import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;

public class Main {
    public static void main(String[] args) throws DatatypeConfigurationException {
        String givenDateTimeString = "2020-11-08T13:05:46.000-07:00";
        XMLGregorianCalendar xmlGregorianCalendar = DatatypeFactory.newInstance()
                .newXMLGregorianCalendar(givenDateTimeString);
        System.out.println(xmlGregorianCalendar);
    }
}

输出：

2020-11-08T13:05:46.000-07:00

import java.time.OffsetDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        String givenDateTimeString = "2020-11-08T13:05:46.000-07:00";
        OffsetDateTime odt = OffsetDateTime.parse(givenDateTimeString);
        // Default format i.e. OffsetDateTime#toString
        System.out.println(odt);

        // Custom format
        System.out.println(odt.format(DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ss.SSSXXX", Locale.ENGLISH)));

        // Convert it to date-time at UTC
        OffsetDateTime odtUTC = odt.withOffsetSameInstant(ZoneOffset.UTC);
        System.out.println(odtUTC);
        System.out.println(odtUTC.format(DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ss.SSSX", Locale.ENGLISH)));
    }
}

2020-11-08T13:05:46-07:00
2020-11-08T13:05:46.000-07:00
2020-11-08T20:05:46Z
2020-11-08T20:05:46.000Z

不过，我建议你换成新的

使用现代日期时间API:

2020-11-08T13:05:46.000-07:00

import java.time.OffsetDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        String givenDateTimeString = "2020-11-08T13:05:46.000-07:00";
        OffsetDateTime odt = OffsetDateTime.parse(givenDateTimeString);
        // Default format i.e. OffsetDateTime#toString
        System.out.println(odt);

        // Custom format
        System.out.println(odt.format(DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ss.SSSXXX", Locale.ENGLISH)));

        // Convert it to date-time at UTC
        OffsetDateTime odtUTC = odt.withOffsetSameInstant(ZoneOffset.UTC);
        System.out.println(odtUTC);
        System.out.println(odtUTC.format(DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ss.SSSX", Locale.ENGLISH)));
    }
}

2020-11-08T13:05:46-07:00
2020-11-08T13:05:46.000-07:00
2020-11-08T20:05:46Z
2020-11-08T20:05:46.000Z

输出：

2020-11-08T13:05:46.000-07:00

import java.time.OffsetDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        String givenDateTimeString = "2020-11-08T13:05:46.000-07:00";
        OffsetDateTime odt = OffsetDateTime.parse(givenDateTimeString);
        // Default format i.e. OffsetDateTime#toString
        System.out.println(odt);

        // Custom format
        System.out.println(odt.format(DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ss.SSSXXX", Locale.ENGLISH)));

        // Convert it to date-time at UTC
        OffsetDateTime odtUTC = odt.withOffsetSameInstant(ZoneOffset.UTC);
        System.out.println(odtUTC);
        System.out.println(odtUTC.format(DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ss.SSSX", Locale.ENGLISH)));
    }
}

2020-11-08T13:05:46-07:00
2020-11-08T13:05:46.000-07:00
2020-11-08T20:05:46Z
2020-11-08T20:05:46.000Z

有关现代日期时间API的更多信息，请访问