我有jdk java版本＆＃34; 1.8.0_45＆＃34;，我正在使用joda time api（joda-time-2.7.jar）
By using Joda time api i am getting a wrong date.
By using Jdk 8 hijri date api i am getting a correct date.
我需要使用java api将格里高利日期转换为日期。
我的示例测试类如下：
import org.joda.time.*;
import org.joda.time.chrono.*;
import java.time.*;
import java.time.chrono.HijrahChronology;
import java.util.*;
public class Test {
public static void main(String[] args) throws Exception {
DateTime dtISO = new DateTime();
System.out.println("dtISO = "+dtISO);
DateTime dtIslamic = dtISO.withChronology(IslamicChronology.getInstance(DateTimeZone.UTC ));
System.out.println(dtIslamic.getYear()+"-" +dtIslamic.getMonthOfYear()+ "-"+ dtIslamic.getDayOfMonth());
java.time.chrono.HijrahDate hijradate = java.time.chrono.HijrahDate.now();
System.out.println("hijradate "+hijradate);
}
}
此课程的输出是
C:\>java Test
dtISO = 2015-05-24T09:44:51.704+04:00
1436-8-5
hijradate Hijrah-umalqura AH 1436-08-06
你能告诉我joda api是正确的还是错的？
我的生产服务器有JDK1.6我现在无法将其升级到1.8，所以请让我知道您的建议以获得正确的日期....等待您的回复....
答案 0 :(得分：2)
您在JodaTime和JDK8之间看到的差异是因为他们使用Hijri日历的不同实现。有多种算法来计算（近似）Hijri日期。
Jdk8的HijrahChoronology使用了Umm-AlQura日历的实现，该日历与lock mechanism中定义的沙特阿拉伯官方Hijri日历非常匹配。
JodaTime IslamicChronology有不同的实现，你可以使用它的工厂方法选择http://www.ummulqura.org.sa/
所以它真的取决于系统受众。如果您在沙特阿拉伯或任何依赖于JDK8实施的UmmAlQura日历棒的国家。
答案 1 :(得分：0)
我在http://junaedhalim.blogspot.com/2010/01/hijri-calendar-in-java-using-kuwaiti.html找到了这段代码，希望它可以帮到你
import java.util.Calendar; import java.util.Date;
/**
*
* @author junaed
*/
public class HijriCalendar
{
private int[] userDateG;
private int[] userDateH;
private WaqtMidlet midlet;
private Calendar cal;
private int currentHijriDate;
private int currentHijriMonth;
private int currentHijriYear;
public static final String[] HIJRI_MONTHS =
{
"Muharram", "Safar", "Rabi' al-awwal", "Rabi' al-thani", "Jumada al-awwal",
"Jumada al-thani", "Rajab", "Sha'aban", "Ramadan", "Shawwal", "Dhu al-Qi'dah", "Dhu al-Hijjah"
};
public static final int[] BASE_DATE_G =
{
18, 11, 2009, 0, 0
};
public static final int[] BASE_DATE_H =
{
1, 0, 1431, 0, 0
};
public HijriCalendar(WaqtMidlet midlet)
{
this.midlet = midlet;
cal = Calendar.getInstance();
Date date = new Date();
cal.setTime(date);
}
private void updateDefinedTime()
{
String uTimeH = midlet.getRmsManager().getString(ApplicationConstants.RMS_HIJRI_DATE);
// String uTimeH = "";
if (uTimeH == null || uTimeH.equalsIgnoreCase(""))
{
userDateG = ApplicationConstants.BASE_DATE_G;
userDateH = ApplicationConstants.BASE_DATE_H;
}
else
{
System.out.println("uTimeH = " + uTimeH);
int date = Integer.parseInt(uTimeH.substring(0, uTimeH.indexOf(';')));
String rest = uTimeH.substring(uTimeH.indexOf(';') + 1);
int month = Integer.parseInt(rest.substring(0, rest.indexOf(';')));
rest = rest.substring(rest.indexOf(';') + 1);
int year = Integer.parseInt(rest.substring(0, rest.indexOf(';')));
rest = rest.substring(rest.indexOf(';') + 1);
int hour = Integer.parseInt(rest.substring(0, rest.indexOf(';')));
rest = rest.substring(rest.indexOf(';') + 1);
int minute = Integer.parseInt(rest);
userDateH = new int[]
{
date, month, year, hour, minute
};
// String uTimeG = "";
String uTimeG = midlet.getRmsManager().getString(ApplicationConstants.RMS_GREGORIAN_DATE);
System.out.println("uTimeG = " + uTimeG);
date = Integer.parseInt(uTimeG.substring(0, uTimeG.indexOf(';')));
rest = uTimeG.substring(uTimeG.indexOf(';') + 1);
month = Integer.parseInt(rest.substring(0, rest.indexOf(';')));
rest = rest.substring(rest.indexOf(';') + 1);
year = Integer.parseInt(rest.substring(0, rest.indexOf(';')));
userDateG = new int[]
{
date, month, year, hour, minute
};
}
cal.set(Calendar.HOUR_OF_DAY, userDateG[3]);
cal.set(Calendar.MINUTE, userDateG[4]);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.DATE, userDateG[0]);
cal.set(Calendar.MONTH, userDateG[1]);
cal.set(Calendar.YEAR, userDateG[2]);
currentHijriDate = userDateH[0];
currentHijriMonth = userDateH[1];
currentHijriYear = userDateH[2];
}
private boolean isALeapYear(int year)
{
int modValue = year % 30;
switch (modValue)
{
case 2:
return true;
case 5:
return true;
case 7:
return true;
case 10:
return true;
case 13:
return true;
case 15:
return true;
case 18:
return true;
case 21:
return true;
case 24:
return true;
case 26:
return true;
case 29:
return true;
}
return false;
}
private int getDaysInThisYear(int year)
{
if (isALeapYear(year))
{
return 355;
}
return 354;
}
public int getDaysInThisMonth(int month, int year)
{
if (month % 2 != 0)
{
return 30;
}
else
{
if (month == 12)
{
if (isALeapYear(year))
{
return 30;
}
}
return 29;
}
}
private void addOneDayToCurrentDate()
{
currentHijriDate++;
if(currentHijriDate >= 29)
{
int daysInCurrentMonth = getDaysInThisMonth(currentHijriMonth, currentHijriYear);
if( currentHijriDate > daysInCurrentMonth)
{
currentHijriDate = 1;
currentHijriMonth++;
if(currentHijriMonth > 11)
{
currentHijriMonth = 1;
currentHijriYear++;
}
}
}
}
private void addDays(long days)
{
for(long i = 0; i< days; i++)
{
addOneDayToCurrentDate();
}
}
public String getCurrentDateStr()
{
updateDefinedTime();
Date date = new Date();
// int currentTime = calendar.get(Calendar.HOUR_OF_DAY);
long diff = date.getTime() - cal.getTime().getTime();
long days = diff / (1000 * 86400);
addDays(days);
String ret = currentHijriYear + " "+HIJRI_MONTHS[currentHijriMonth] + ", " + currentHijriDate;
return ret;
// return midlet.getRmsManager().getString(ApplicationConstants.RMS_HIJRI_DATE);
}
}
答案 2 :(得分：0)
尝试使用ICU4J。它的Calendar类不会扩展java.util.Calendar，但它们可以正确处理Hijri日期（以及许多其他日历系统）。使用Java 1.6.0_31，我能够使用IslamicCalendar类得到我认为正确的结果：
import java.util.Date;
import java.util.Locale;
import com.ibm.icu.util.Calendar;
import com.ibm.icu.util.IslamicCalendar;
public class HijriDate {
public static void main(String[] args) {
java.util.Calendar gregorianCal =
java.util.Calendar.getInstance(Locale.US);
System.out.printf("%tF%n", gregorianCal);
Date date = gregorianCal.getTime();
Calendar cal = new IslamicCalendar();
cal.setTime(date);
System.out.printf("%02d-%02d-%02d%n",
cal.get(Calendar.YEAR),
cal.get(Calendar.MONTH) + 1,
cal.get(Calendar.DAY_OF_MONTH));
}
}