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鉴于公历的开始日期是1582年10月15日,请考虑以下测试,并请帮助我了解会发生什么情况:
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import javax.xml.datatype.DatatypeFactory;
import org.junit.Test;
@Test
public void gregorianToDateConversion() {
GregorianCalendar calendar = null;
Date date = null;
calendar = new GregorianCalendar(1582, 9, 04);
date = calendar.getTime();
System.out.println("new GregorianCalendar(1582, 9, 4) -> calendar[DAY_OF_MONTH ["+calendar.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+calendar.get(Calendar.MONTH)+"], YEAR ["+calendar.get(Calendar.YEAR)+"]]");
System.out.println("calendar.getTime() -> Date:" + date);
calendar = new GregorianCalendar(1582, 9, 05);
date = calendar.getTime();
System.out.println("\nnew GregorianCalendar(1582, 9, 5) -> calendar[DAY_OF_MONTH ["+calendar.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+calendar.get(Calendar.MONTH)+"], YEAR ["+calendar.get(Calendar.YEAR)+"]]");
System.out.println("calendar.getTime() -> Date:" + date);
calendar = new GregorianCalendar(1582, 9, 14);
date = calendar.getTime();
System.out.println("\nnew GregorianCalendar(1582, 9, 14) -> calendar[DAY_OF_MONTH ["+calendar.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+calendar.get(Calendar.MONTH)+"], YEAR ["+calendar.get(Calendar.YEAR)+"]]");
System.out.println("calendar.getTime() -> Date:" + date);
calendar = new GregorianCalendar(1582, 9, 15);
date = calendar.getTime();
System.out.println("\nnew GregorianCalendar(1582, 9, 15) -> calendar[DAY_OF_MONTH ["+calendar.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+calendar.get(Calendar.MONTH)+"], YEAR ["+calendar.get(Calendar.YEAR)+"]]");
System.out.println("calendar.getTime() -> Date:" + date);
String dateToParse = null;
dateToParse = "1582-10-04";
System.out.println("\nString to parse: " + dateToParse);
calendar = parseDateTime(dateToParse);
if(calendar != null) {
date = calendar.getTime();
System.out.println("datatypeFactory.newXMLGregorianCalendar(s).toGregorianCalendar() -> \n calendar[DAY_OF_MONTH ["+calendar.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+calendar.get(Calendar.MONTH)+"], YEAR ["+calendar.get(Calendar.YEAR)+"]]");
System.out.println("calendar.getTime() -> Date: " + date);
}
dateToParse = "1582-10-05";
System.out.println("\nString to parse: " + dateToParse);
calendar = parseDateTime(dateToParse);
if(calendar != null) {
date = calendar.getTime();
System.out.println("datatypeFactory.newXMLGregorianCalendar(s).toGregorianCalendar() -> \n calendar[DAY_OF_MONTH ["+calendar.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+calendar.get(Calendar.MONTH)+"], YEAR ["+calendar.get(Calendar.YEAR)+"]]");
System.out.println("calendar.getTime() -> Date: " + date);
}
dateToParse = "1582-10-14";
System.out.println("\nString to parse: " + dateToParse);
calendar = parseDateTime(dateToParse);
if(calendar != null) {
date = calendar.getTime();
System.out.println("datatypeFactory.newXMLGregorianCalendar(s).toGregorianCalendar() -> \n calendar[DAY_OF_MONTH ["+calendar.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+calendar.get(Calendar.MONTH)+"], YEAR ["+calendar.get(Calendar.YEAR)+"]]");
System.out.println("calendar.getTime() -> Date: " + date);
}
dateToParse = "1582-10-15";
System.out.println("\nString to parse: " + dateToParse);
calendar = parseDateTime(dateToParse);
if(calendar != null) {
date = calendar.getTime();
System.out.println("datatypeFactory.newXMLGregorianCalendar(s).toGregorianCalendar() -> \n calendar[DAY_OF_MONTH ["+calendar.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+calendar.get(Calendar.MONTH)+"], YEAR ["+calendar.get(Calendar.YEAR)+"]]");
System.out.println("calendar.getTime() -> Date: " + date);
}
}
private GregorianCalendar parseDateTime(String s) {
DatatypeFactory datatypeFactory = null;
try {
datatypeFactory = DatatypeFactory.newInstance();
return datatypeFactory.newXMLGregorianCalendar(s).toGregorianCalendar();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
new GregorianCalendar(1582, 9, 4) -> calendar[DAY_OF_MONTH [4], MONTH [9], YEAR [1582]] **OK**
calendar.getTime() -> Date:Thu Oct 04 00:00:00 CET 1582 **OK**
new GregorianCalendar(1582, 9, 5) -> calendar[DAY_OF_MONTH [15], MONTH [9], YEAR [1582]] **+ 10 days ??**
calendar.getTime() -> Date:Fri Oct 15 00:00:00 CET 1582 **coherent with calendar**
new GregorianCalendar(1582, 9, 14) -> calendar[DAY_OF_MONTH [24], MONTH [9], YEAR [1582]] **+ 10 days ??**
calendar.getTime() -> Date:Sun Oct 24 00:00:00 CET 1582 **coherent with calendar**
new GregorianCalendar(1582, 9, 15) -> calendar[DAY_OF_MONTH [15], MONTH [9], YEAR [1582]] **OK**
calendar.getTime() -> Date:Fri Oct 15 00:00:00 CET 1582 **OK**
String to parse: 1582-10-04
datatypeFactory.newXMLGregorianCalendar(s).toGregorianCalendar() ->
calendar[DAY_OF_MONTH [4], MONTH [9], YEAR [1582]]
calendar.getTime() -> Date: Mon Sep 24 00:00:00 CET 1582 **Not coherent with calendar. Conversion to julian date?**
String to parse: 1582-10-05
datatypeFactory.newXMLGregorianCalendar(s).toGregorianCalendar() ->
calendar[DAY_OF_MONTH [5], MONTH [9], YEAR [1582]]
calendar.getTime() -> Date: Tue Sep 25 00:00:00 CET 1582 **Not coherent with calendar. Conversion to julian date?**
String to parse: 1582-10-14
datatypeFactory.newXMLGregorianCalendar(s).toGregorianCalendar() ->
calendar[DAY_OF_MONTH [14], MONTH [9], YEAR [1582]] **OK**
calendar.getTime() -> Date: Thu Oct 04 00:00:00 CET 1582 **Not coherent with calendar. Conversion to julian date?**
String to parse: 1582-10-15
datatypeFactory.newXMLGregorianCalendar(s).toGregorianCalendar() ->
calendar[DAY_OF_MONTH [15], MONTH [9], YEAR [1582]] **OK**
calendar.getTime() -> Date: Fri Oct 15 00:00:00 CET 1582 **OK**
new GregorianCalendar(1582, 9, 4)
calendar[DAY_OF_MONTH [4], MONTH [9], YEAR [1582]]
Date:Thu Oct 04 00:00:00 CET 1582, consistent with Calendar.
new GregorianCalendar(1582, 9, 5)
calendar[DAY_OF_MONTH [15], MONTH [9], YEAR [1582]]
Date:Fri Oct 15 00:00:00 CET 1582
new GregorianCalendar(1582, 9, 15)
calendar[DAY_OF_MONTH [15], MONTH [9], YEAR [1582]]
Date:Fri Oct 15 00:00:00 CET 1582
new GregorianCalendar(1582, 9, 5)
calendar[DAY_OF_MONTH [5], MONTH [9], YEAR [1582]]
calendar[DAY_OF_MONTH [4], MONTH [9], YEAR [1582]]
Date: Mon Sep 24 00:00:00 CET 1582
calendar[DAY_OF_MONTH [5], MONTH [9], YEAR [1582]]
Date: Tue Sep 25 00:00:00 CET 1582 (Julian Date? Why?)
calendar[DAY_OF_MONTH [14], MONTH [9], YEAR [1582]]
Date: Thu Oct 04 00:00:00 CET 1582
calendar[DAY_OF_MONTH [15], MONTH [9], YEAR [1582]]
Date: Fri Oct 15 00:00:00 CET 1582
GregorianCalendar proleptic = new GregorianCalendar();
proleptic.setGregorianChange(new Date(Long.MIN_VALUE));
proleptic.set(Calendar.DAY_OF_MONTH, 5);
proleptic.set(Calendar.MONTH, 9);
proleptic.set(Calendar.YEAR, 1582);
System.out.println("proleptic [DAY_OF_MONTH ["+proleptic.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+proleptic.get(Calendar.MONTH)+"], YEAR ["+proleptic.get(Calendar.YEAR)+"]");
Date prolepticDate = proleptic.getTime();
System.out.println("prolepticDate ["+prolepticDate+"]");
proleptic [DAY_OF_MONTH [5], MONTH [9], YEAR [1582]
prolepticDate [Tue Sep 25 00:24:07 CET 1582]
GregorianCalendar proleptic = null;
GregorianCalendar calendar = null;
Date date = null;
// ---- JULIAN PERIOD ----
proleptic = new GregorianCalendar();
proleptic.clear();
proleptic.setGregorianChange(new Date(Long.MIN_VALUE));
proleptic.set(Calendar.DAY_OF_MONTH, 5);
proleptic.set(Calendar.MONTH, Calendar.FEBRUARY);
proleptic.set(Calendar.YEAR, 1582);
System.out.println("proleptic_calendar_5Feb1582 [DAY_OF_MONTH ["+proleptic.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+proleptic.get(Calendar.MONTH)+"], YEAR ["+proleptic.get(Calendar.YEAR)+"]");
date = proleptic.getTime();
System.out.println("date_5Feb1582 from proleptic ["+date+"]");
calendar = new GregorianCalendar(1582, 1, 5);
date = calendar.getTime();
System.out.println("new GregorianCalendar(1582, 1, 5) -> [DAY_OF_MONTH ["+calendar.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+calendar.get(Calendar.MONTH)+"], YEAR ["+calendar.get(Calendar.YEAR)+"]]");
System.out.println("new GregorianCalendar(1582, 1, 5) .getTime() -> Date:" + date);
System.out.println("proleptic_calendar_5Feb1582 in millis ["+proleptic.getTimeInMillis()+"], new GregorianCalendar(1582, 1, 5) in millis ["+calendar.getTimeInMillis()+"], millis are equal ["+ (proleptic.getTimeInMillis() == calendar.getTimeInMillis()) +"]");
//--------
System.out.println("\n");
// ---- transition period ----
proleptic = new GregorianCalendar();
proleptic.clear();
proleptic.setGregorianChange(new Date(Long.MIN_VALUE));
proleptic.set(Calendar.DAY_OF_MONTH, 8);
proleptic.set(Calendar.MONTH, Calendar.OCTOBER);
proleptic.set(Calendar.YEAR, 1582);
System.out.println("proleptic_calendar_8Oct1582 [DAY_OF_MONTH ["+proleptic.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+proleptic.get(Calendar.MONTH)+"], YEAR ["+proleptic.get(Calendar.YEAR)+"]");
date = proleptic.getTime();
System.out.println("date_5Oct1582 from proleptic ["+date+"]");
calendar = new GregorianCalendar(1582, 9, 8);
date = calendar.getTime();
System.out.println("new GregorianCalendar(1582, 9, 8) -> [DAY_OF_MONTH ["+calendar.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+calendar.get(Calendar.MONTH)+"], YEAR ["+calendar.get(Calendar.YEAR)+"]]");
System.out.println("new GregorianCalendar(1582, 9, 8) .getTime() -> Date:" + date);
System.out.println("proleptic_calendar_8Oct1582 in millis ["+proleptic.getTimeInMillis()+"], new GregorianCalendar(1582, 9, 8) in millis ["+calendar.getTimeInMillis()+"], millis are equal ["+ (proleptic.getTimeInMillis() == calendar.getTimeInMillis()) +"]");
//--------
System.out.println("\n");
// ---- GREGORIAN PERIOD ----
proleptic = new GregorianCalendar();
proleptic.clear();
proleptic.setGregorianChange(new Date(Long.MIN_VALUE));
proleptic.set(Calendar.DAY_OF_MONTH, 5);
proleptic.set(Calendar.MONTH, Calendar.DECEMBER);
proleptic.set(Calendar.YEAR, 1582);
System.out.println("proleptic_calendar_5Dec1582 [DAY_OF_MONTH ["+proleptic.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+proleptic.get(Calendar.MONTH)+"], YEAR ["+proleptic.get(Calendar.YEAR)+"]");
date = proleptic.getTime();
System.out.println("date_5Dec1582 from proleptic ["+date+"]");
calendar = new GregorianCalendar(1582, 11, 5);
date = calendar.getTime();
System.out.println("new GregorianCalendar(1582, 11, 5) -> [DAY_OF_MONTH ["+calendar.get(Calendar.DAY_OF_MONTH)+"], MONTH ["+calendar.get(Calendar.MONTH)+"], YEAR ["+calendar.get(Calendar.YEAR)+"]]");
System.out.println("new GregorianCalendar(1582, 11, 5) .getTime() -> Date:" + date);
System.out.println("proleptic_calendar_5Dec1582 in millis ["+proleptic.getTimeInMillis()+"], new GregorianCalendar(1582, 11, 5) in millis ["+calendar.getTimeInMillis()+"], millis are equal ["+ (proleptic.getTimeInMillis() == calendar.getTimeInMillis()) +"]");
//--------
proleptic_calendar_5Feb1582 [DAY_OF_MONTH [5], MONTH [1], YEAR [1582]
date_5Feb1582 from proleptic [Fri Jan 26 00:00:00 CET 1582]
new GregorianCalendar(1582, 1, 5) -> [DAY_OF_MONTH [5], MONTH [1], YEAR [1582]]
new GregorianCalendar(1582, 1, 5) .getTime() -> Date:Mon Feb 05 00:00:00 CET 1582
proleptic_calendar_5Feb1582 in millis [-12241069200000], new GregorianCalendar(1582, 1, 5) in millis [-12240205200000], millis are equal [false]
proleptic_calendar_8Oct1582 [DAY_OF_MONTH [8], MONTH [9], YEAR [1582]
date_5Oct1582 from proleptic [Fri Sep 28 00:00:00 CET 1582]
new GregorianCalendar(1582, 9, 8) -> [DAY_OF_MONTH [18], MONTH [9], YEAR [1582]]
new GregorianCalendar(1582, 9, 8) .getTime() -> Date:Mon Oct 18 00:00:00 CET 1582
proleptic_calendar_8Oct1582 in millis [-12219901200000], new GregorianCalendar(1582, 9, 8) in millis [-12219037200000], millis are equal [false]
proleptic_calendar_5Dec1582 [DAY_OF_MONTH [5], MONTH [11], YEAR [1582]
date_5Dec1582 from proleptic [Sun Dec 05 00:00:00 CET 1582]
new GregorianCalendar(1582, 11, 5) -> [DAY_OF_MONTH [5], MONTH [11], YEAR [1582]]
new GregorianCalendar(1582, 11, 5) .getTime() -> Date:Sun Dec 05 00:00:00 CET 1582
proleptic_calendar_5Dec1582 in millis [-12214890000000], new GregorianCalendar(1582, 11, 5) in millis [-12214890000000], millis are equal [true]
最佳答案
方法newXMLGregorianCalendar(s)
必须使用格式为“yyyy-MM-dd”的字符串进行输入,该字符串在月中使用两位数字。但是,您已经定义了字符串“1582-10-4”和“1582-10-5”(而不是“1582-10-04”和“1582-10-05”)。
我已经测试了替代品,并且可以使用。
请记住,XMLGregorianCalendar非常严格,并且还根据ISO-8601中的标准约定使用多用公历。也就是说,它甚至在1582年之前都使用了公历leap年规则。这解释了您的陈述“与日历不一致。转换为儒略日吗?”。例如:
教皇已删除日期1582-10-04(旧儒略历)后的10天,因此在此之后,日期1582-10-15紧随其后是新的公历。在阳历公历中,日期1582-10-14的定义很明确,对应于1582-10-15之前的一天,因此(历史朱利安)日期1582-10-04。
编辑OP后更新:
您的问题的简单答案“是什么决定我们是否使用了阳历公历?”是:您决定。
详细信息:如果使用XMLGregorianCalendar
,则使用多历公历。
如果使用java.util.GregorianCalendar
,则默认情况下将日期1582-10-15选择为公历的第一天。所有以前的日子都被认为是儒略历。但是,您可以覆盖默认切换日期。为此,您只需使用适当的参数调用setGregorianChange(Date)方法即可。 new Date(Long.MIN_VALUE)
的参数设置多久的公历,而new Date(Long.MAX_VALUE)
的参数设置多久的儒略历。
同样重要的是要注意
a)大多数国家在1582-10-15都没有改用公历(只有主要的天主教国家),
b)历史日期还由其他因素决定,例如不同的年初(这使得JDK中的完整julian-gregorian-calendar实现完全不足-当前没有提供支持的库)。
在EDIT-2之后更新:
输出proleptic [DAY_OF_MONTH [5], MONTH [9], YEAR [1582]
是预期的,并保留了多功的公历中定义的输入(在1582-10-15之前的10天,向后应用公历leap年规则)。
输出的prolepticDate [Tue Sep 25 00:24:07 CET 1582]
是一个完全不同的故事。但是,如果您记得确实在toString()
上调用了java.util.Date
方法,这是可以理解的。 该方法在内部实例化一个新的公历日历对象,默认开关为1582-10-15。 Date
-object不知道(也没有内部状态)设置公历更改的日期,因此其toString()
-method仅应用默认值。最后,只是将日历对象以Date.toString()
的特定格式重新计算/重新格式化为朱利安日历表示形式。即:1582-09-25(切换前十天)。
由于@VGR的评论而更新:
我的测试证明,例如,对于多义日期1582-10-05,自unix-epoch以来,XMLGregorianCalendar
和新GregorianCalendar
的特殊构造在毫秒中产生的时间相同,请参见:
String s = "1582-10-05";
DatatypeFactory datatypeFactory = DatatypeFactory.newInstance();
GregorianCalendar xml = datatypeFactory.newXMLGregorianCalendar(s).toGregorianCalendar();
GregorianCalendar proleptic = new GregorianCalendar();
proleptic.clear(); // very important for proper comparison to reset time part to zero
proleptic.setGregorianChange(new Date(Long.MIN_VALUE));
proleptic.set(Calendar.DAY_OF_MONTH, 5);
proleptic.set(Calendar.MONTH, Calendar.OCTOBER);
proleptic.set(Calendar.YEAR, 1582);
boolean isEqual = (xml.getTimeInMillis() == proleptic.getTimeInMillis());
System.out.println("XML-millisSinceEpoch: " + xml.getTimeInMillis());
System.out.println("Proleptic-millisSinceEpoch: " + proleptic.getTimeInMillis());
System.out.println("XML==Proleptic (1582-10-05): " + isEqual);
System.out.println(
"proleptic [DAY_OF_MONTH [" + proleptic.get(Calendar.DAY_OF_MONTH) + "], MONTH ["
+ proleptic.get(Calendar.MONTH) + "], YEAR [" + proleptic.get(Calendar.YEAR) + "]"
);
System.out.println("Date.toString() [" + proleptic.getTime() + "]");
XML-millisSinceEpoch: -12220160400000
Proleptic-millisSinceEpoch: -12220160400000
XML==Proleptic (1582-10-05): true
proleptic [DAY_OF_MONTH [5], MONTH [9], YEAR [1582]
Date.toString() [Tue Sep 25 00:00:00 CET 1582]
关于java - 1582年10月15日之前的日历到日期的转换。公历到儒略历的切换,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23457470/
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