我如何将公历年转换为回历年？

Question

我想使用 HijrahChronology 库将公历日期转换为 java 8 中的回历日期。我已经尝试了下面的代码，但无法正常工作。

  Date date = new Date(); // Gregorian date
  Calendar cl=Calendar.getInstance();
  cl.set(Calendar.YEAR, date.getYear());

  HijrahDate islamyDate = HijrahChronology.INSTANCE.date(LocalDate.of(cl.get(Calendar.YEAR),cl.get(Calendar.MONTH)+1, cl.get(Calendar.DATE)));

        DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("uuuu");
        String gregorianString = "1994";
        LocalDate gregorianDate = LocalDate.parse(gregorianString, dateFormatter);
        HijrahDate islamicDate = HijrahDate.from(gregorianDate);
        System.out.println("Islamic date: " + islamicDate);

更新： 我只想转换年份部分。

Answer 1

您可以简单地传递一个 TemporalAccessor 例如LocalDate、ZonedDateTime等到HijrahChronology.INSTANCE#date如下图：

import java.time.LocalDate;
import java.time.Month;
import java.time.ZoneId;
import java.time.chrono.HijrahChronology;
import java.time.chrono.HijrahDate;
import java.time.temporal.TemporalAdjusters;

public class Main {
    public static void main(String[] args) {
        // Change the time-zone as per your requirement.
        ZoneId myZoneId = ZoneId.of("Etc/UTC");

        HijrahDate hijrahDate1 = HijrahChronology.INSTANCE.date(LocalDate.now(myZoneId));
        System.out.println(hijrahDate1);

        // ########Another example########

        // HijrahDate on the last day of January 1994 at the time zone of Etc/UTC
        HijrahDate hijrahDate2 = HijrahChronology
                .INSTANCE                                   // Instance of HijrahChronology
                .date(LocalDate.of(1994, Month.JANUARY, 1)  // LocalDate of 01-Jan-1994
                .with(TemporalAdjusters.lastDayOfMonth())   // On the last day of Jan-1994
                .atStartOfDay()                             // At the start of the day i.e. 00:00
                .atZone(myZoneId));                         // At the time zone of Etc/UTC
        System.out.println(hijrahDate2);
    }
}

输出：

Hijrah-umalqura AH 1441-12-27
Hijrah-umalqura AH 1414-08-19

在 Trail: Date Time.

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我如何将公历年转换为回历年？

How can i convert Gregorain year to Hijri year?

date

java-8

java-time

hijri