Fix end year issue in Nabonassar ranges

src/chronology/domain/Date.test.ts

@@ -197,6 +197,19 @@ describe('MesopotamianDate', () => {
     )
   })
 
+  it('returns the correct string representation (Nabonassar era, king only)', () => {
+    const date = new MesopotamianDate({
+      year: { value: '' },
+      month: { value: '' },
+      day: { value: '' },
+      king: nabonassarEraKing,
+      isSeleucidEra: false,
+    })
+    expect(date.toString()).toBe(
+      'Darius I (ca. 14 April 521 - 5 April 485 BCE PJC | ca. 8 April 521 - 31 March 485 BCE PGC)'
+    )
+  })
+
   it('returns the correct string representation (Ur III)', () => {
     const date = new MesopotamianDate({
       year: { value: '10' },

src/chronology/domain/DateBase.ts

@@ -55,6 +55,10 @@ export class MesopotamianDateBase {
     this.isSeleucidEra = isSeleucidEra
     this.isAssyrianDate = isAssyrianDate
     this.ur3Calendar = ur3Calendar
+    this.setRange()
+  }
+
+  private setRange(): void {
     if (
       this.getEmptyFields().length > 0 &&
       [DateType.nabonassarEraDate, DateType.seleucidDate].includes(

src/chronology/domain/DateRange.ts

@@ -125,7 +125,7 @@ export default class DateRange {
       }[field]()
     } else if (dateType === DateType.nabonassarEraDate) {
       return {
-        year: () => `${this.getNabonassarRangeEndYear}`,
+        year: () => `${this.getNabonassarRangeEndYear(date)}`,
         month: () => `${this.getNabonassarDateEndMonth(date)}`,
         day: () => `${this.getNabonassarDateEndDay(date)}`,
       }[field]()
@@ -157,14 +157,12 @@ export default class DateRange {
     return this._converter.calendar.mesopotamianMonthLength ?? 28
   }
 
-  private get nabonassarRangeEndYear(): number {
-    return this._converter.latestDate.regnalYears ?? 1
-  }
-
   private getNabonassarRangeEndYear(date: MesopotamianDateBase): number {
-    return date.getEmptyFields().includes('year')
-      ? this.nabonassarRangeEndYear
-      : parseInt(date.year.value)
+    if (!date.getEmptyFields().includes('year')) {
+      return parseInt(date.year.value)
+    }
+    this._converter.setToMesopotamianDate(date.kingName as string, 1, 1, 1)
+    return this._converter.calendar.regnalYears ?? 1
   }
 
   private getNabonassarDateEndMonth(date: MesopotamianDateBase): number {