ethiopian-gregorian-date-converter/dist/eth.js

Library for converting between Ethiopian and Gregorian dates

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.EthDate = void 0;
const greg_1 = require("./greg");
class EthDate {
    constructor(year, month, day) {
        if (year < 0) {
            throw new Error("Year must be positive");
        }
        if (month < 1 || month > 13) {
            throw new Error("Month must be between 1 and 13");
        }
        if (day < 1 || day > 30) {
            throw new Error("Day must be between 1 and 30");
        }
        if (month === 13) {
            if (year % 4 == 3 && day > 6) {
                throw new Error("Month 13 has only 6 days");
            }
            else if (year % 4 != 3 && day > 5) {
                throw new Error("Month 13 has only 5 days");
            }
        }
        this.year = year;
        this.month = month;
        this.day = day;
    }
    toGreg() {
        const term = this.getTerm(); // 1 to 4
        const day = this.dayOfYear();
        const marker = greg_1.MARKERS.find(m => m.INDEX === term);
        if (!marker) {
            throw new Error("Invalid term marker");
        }
        let gDayOfYear;
        let gYear;
        if (term === 4 && day === 366) {
            // Special case for leap day
            gDayOfYear = 254;
            gYear = this.year + 8;
        }
        else if (day <= marker.DAY_OF_YEAR.MID) {
            // falls in the first segment
            gDayOfYear = day + marker.DAY_OF_YEAR.START - 1;
            gYear = this.year + 7;
        }
        else {
            // falls in second segment
            gDayOfYear = day - marker.DAY_OF_YEAR.MID + 1;
            gYear = this.year + 8;
        }
        return greg_1.GDate.fromDayOfYear(gDayOfYear, gYear);
    }
    toString() {
        return `${this.year}-${this.month}-${this.day}`;
    }
    getTerm() {
        return this.year % 4 + 1;
    }
    dayOfYear() {
        let days = 0;
        for (let i = 1; i < this.month; i++) {
            days += 30;
        }
        days += this.day;
        return days;
    }
    static dayCount(month, year) {
        if (month === 13) {
            return year % 4 === 3 ? 6 : 5;
        }
        return 30;
    }
    static fromDayOfYear(dayOfYear, _year) {
        let month = 1;
        let day = dayOfYear;
        let year = _year;
        if (_year % 4 === 3 && dayOfYear > 366) {
            year += 1;
            day -= 366;
        }
        else if (_year % 4 !== 3 && dayOfYear > 365) {
            year += 1;
            day -= 365;
        }
        while (day > EthDate.dayCount(month, year)) {
            day -= EthDate.dayCount(month, year);
            month++;
        }
        return new EthDate(year, month, day);
    }
}
exports.EthDate = EthDate;