ethio-calendar-converter-angular
Version:
Ethiopian Calendar Converter for Angular applications
131 lines • 17.2 kB
JavaScript
import { Injectable } from '@angular/core';
import * as i0 from "@angular/core";
export class EthiopianCalendarService {
// Ethiopian calendar constants
ETHIOPIAN_MONTHS = 13;
ETHIOPIAN_DAYS_IN_MONTH = 30;
ETHIOPIAN_PAGUME_DAYS = 5; // 6 in leap year
isEthiopianLeapYear(year) {
return (year + 1) % 4 === 0;
}
isGregorianLeapYear(year) {
return (year % 4 === 0 && year % 100 !== 0) || (year % 400 === 0);
}
validateEthiopianDate(date) {
if (date.month < 1 || date.month > this.ETHIOPIAN_MONTHS)
return false;
if (date.month === this.ETHIOPIAN_MONTHS) {
const maxDays = this.isEthiopianLeapYear(date.year) ?
this.ETHIOPIAN_PAGUME_DAYS + 1 :
this.ETHIOPIAN_PAGUME_DAYS;
return date.day >= 1 && date.day <= maxDays;
}
return date.day >= 1 && date.day <= this.ETHIOPIAN_DAYS_IN_MONTH;
}
toGregorian(ethiopianDate) {
if (!this.validateEthiopianDate(ethiopianDate)) {
throw new Error('Invalid Ethiopian date');
}
let { year, month, day } = ethiopianDate;
// Calculate the number of days from Ethiopian new year to the given date
let daysDiff = (month - 1) * this.ETHIOPIAN_DAYS_IN_MONTH + day;
// Basic conversion (Ethiopian new year is typically September 11/12)
let gregorianYear = year + 7;
let gregorianMonth = 9; // September
let gregorianDay = 10; // Start from September 10
// Adjust for Ethiopian leap year
if (this.isEthiopianLeapYear(year)) {
gregorianDay += 1;
}
// Add the difference in days
gregorianDay += daysDiff;
// Adjust the Gregorian date
const gregorianMonthDays = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
if (this.isGregorianLeapYear(gregorianYear)) {
gregorianMonthDays[1] = 29;
}
// Adjust month and day
while (gregorianDay > gregorianMonthDays[gregorianMonth - 1]) {
gregorianDay -= gregorianMonthDays[gregorianMonth - 1];
gregorianMonth++;
if (gregorianMonth > 12) {
gregorianMonth = 1;
gregorianYear++;
if (this.isGregorianLeapYear(gregorianYear)) {
gregorianMonthDays[1] = 29;
}
else {
gregorianMonthDays[1] = 28;
}
}
}
return {
year: gregorianYear,
month: gregorianMonth,
day: gregorianDay
};
}
toEthiopian(gregorianDate) {
let { year, month, day } = gregorianDate;
// Find the Ethiopian year
let ethiopianYear = year - 8;
// Calculate days from Ethiopian new year (September 11/12)
const gregorianMonthDays = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
if (this.isGregorianLeapYear(year)) {
gregorianMonthDays[1] = 29;
}
// Calculate the Ethiopian date
let ethiopianMonth = 1;
let ethiopianDay = 1;
// Adjust based on the Gregorian date
if (month > 9 || (month === 9 && day > 11)) {
ethiopianYear++;
}
// Calculate days from Ethiopian new year
let daysDiff = 0;
if (month > 9) {
// Add days from September to current month
for (let m = 9; m < month; m++) {
daysDiff += gregorianMonthDays[m - 1];
}
daysDiff += day - 11;
}
else if (month < 9) {
// Add remaining days from September to December
for (let m = 9; m <= 12; m++) {
daysDiff += gregorianMonthDays[m - 1];
}
// Add days from January to current month
for (let m = 1; m < month; m++) {
daysDiff += gregorianMonthDays[m - 1];
}
daysDiff += day - 11;
}
else {
// September
daysDiff = day - 11;
}
// Convert days difference to Ethiopian date
ethiopianMonth = Math.floor(daysDiff / 30) + 1;
ethiopianDay = (daysDiff % 30) + 1;
return {
year: ethiopianYear,
month: ethiopianMonth,
day: ethiopianDay
};
}
// Helper method to format dates
formatDate(date, isEthiopian = true) {
const { year, month, day } = date;
return `${year}-${month.toString().padStart(2, '0')}-${day.toString().padStart(2, '0')}${isEthiopian ? ' (Ethiopian)' : ' (Gregorian)'}`;
}
static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.12", ngImport: i0, type: EthiopianCalendarService, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
static ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "17.3.12", ngImport: i0, type: EthiopianCalendarService, providedIn: 'root' });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.12", ngImport: i0, type: EthiopianCalendarService, decorators: [{
type: Injectable,
args: [{
providedIn: 'root'
}]
}] });
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// 6 in leap year\n\n  private isEthiopianLeapYear(year: number): boolean {\n    return (year + 1) % 4 === 0;\n  }\n\n  private isGregorianLeapYear(year: number): boolean {\n    return (year % 4 === 0 && year % 100 !== 0) || (year % 400 === 0);\n  }\n\n  private validateEthiopianDate(date: EthiopianDate): boolean {\n    if (date.month < 1 || date.month > this.ETHIOPIAN_MONTHS) return false;\n    if (date.month === this.ETHIOPIAN_MONTHS) {\n      const maxDays = this.isEthiopianLeapYear(date.year) ? \n        this.ETHIOPIAN_PAGUME_DAYS + 1 : \n        this.ETHIOPIAN_PAGUME_DAYS;\n      return date.day >= 1 && date.day <= maxDays;\n    }\n    return date.day >= 1 && date.day <= this.ETHIOPIAN_DAYS_IN_MONTH;\n  }\n\n  toGregorian(ethiopianDate: EthiopianDate): GregorianDate {\n    if (!this.validateEthiopianDate(ethiopianDate)) {\n      throw new Error('Invalid Ethiopian date');\n    }\n\n    let { year, month, day } = ethiopianDate;\n    \n    // Calculate the number of days from Ethiopian new year to the given date\n    let daysDiff = (month - 1) * this.ETHIOPIAN_DAYS_IN_MONTH + day;\n    \n    // Basic conversion (Ethiopian new year is typically September 11/12)\n    let gregorianYear = year + 7;\n    let gregorianMonth = 9; // September\n    let gregorianDay = 10; // Start from September 10\n\n    // Adjust for Ethiopian leap year\n    if (this.isEthiopianLeapYear(year)) {\n      gregorianDay += 1;\n    }\n\n    // Add the difference in days\n    gregorianDay += daysDiff;\n\n    // Adjust the Gregorian date\n    const gregorianMonthDays = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];\n    if (this.isGregorianLeapYear(gregorianYear)) {\n      gregorianMonthDays[1] = 29;\n    }\n\n    // Adjust month and day\n    while (gregorianDay > gregorianMonthDays[gregorianMonth - 1]) {\n      gregorianDay -= gregorianMonthDays[gregorianMonth - 1];\n      gregorianMonth++;\n      if (gregorianMonth > 12) {\n        gregorianMonth = 1;\n        gregorianYear++;\n        if (this.isGregorianLeapYear(gregorianYear)) {\n          gregorianMonthDays[1] = 29;\n        } else {\n          gregorianMonthDays[1] = 28;\n        }\n      }\n    }\n\n    return {\n      year: gregorianYear,\n      month: gregorianMonth,\n      day: gregorianDay\n    };\n  }\n\n  toEthiopian(gregorianDate: GregorianDate): EthiopianDate {\n    let { year, month, day } = gregorianDate;\n    \n    // Find the Ethiopian year\n    let ethiopianYear = year - 8;\n    \n    // Calculate days from Ethiopian new year (September 11/12)\n    const gregorianMonthDays = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];\n    if (this.isGregorianLeapYear(year)) {\n      gregorianMonthDays[1] = 29;\n    }\n\n    // Calculate the Ethiopian date\n    let ethiopianMonth = 1;\n    let ethiopianDay = 1;\n    \n    // Adjust based on the Gregorian date\n    if (month > 9 || (month === 9 && day > 11)) {\n      ethiopianYear++;\n    }\n\n    // Calculate days from Ethiopian new year\n    let daysDiff = 0;\n    if (month > 9) {\n      // Add days from September to current month\n      for (let m = 9; m < month; m++) {\n        daysDiff += gregorianMonthDays[m - 1];\n      }\n      daysDiff += day - 11;\n    } else if (month < 9) {\n      // Add remaining days from September to December\n      for (let m = 9; m <= 12; m++) {\n        daysDiff += gregorianMonthDays[m - 1];\n      }\n      // Add days from January to current month\n      for (let m = 1; m < month; m++) {\n        daysDiff += gregorianMonthDays[m - 1];\n      }\n      daysDiff += day - 11;\n    } else {\n      // September\n      daysDiff = day - 11;\n    }\n\n    // Convert days difference to Ethiopian date\n    ethiopianMonth = Math.floor(daysDiff / 30) + 1;\n    ethiopianDay = (daysDiff % 30) + 1;\n\n    return {\n      year: ethiopianYear,\n      month: ethiopianMonth,\n      day: ethiopianDay\n    };\n  }\n\n  // Helper method to format dates\n  formatDate(date: EthiopianDate | GregorianDate, isEthiopian: boolean = true): string {\n    const { year, month, day } = date;\n    return `${year}-${month.toString().padStart(2, '0')}-${day.toString().padStart(2, '0')}${\n      isEthiopian ? ' (Ethiopian)' : ' (Gregorian)'\n    }`;\n  }\n} "]}