jtc-utils/mjs/lib/formatDate.mjs

Utilities for Japanese Traditional Companies

import { format as _format, isValid, parseISO } from "date-fns";
import { JapaneseEra } from "./JapaneseEra.mjs";
import { enUS, ja } from "./locale/index.mjs";
import { DateFormat } from "./util/DateFormat.mjs";
import { getLocale } from "./util/getLocale.mjs";
import { getTimeZone } from "./util/getTimeZone.mjs";
import { getTimeZoneOffset } from "./util/getTimeZoneOffset.mjs";
export function formatDate(date, format, options) {
    const timeZone = options?.timeZone;
    let dDate;
    if (!date) {
        return "";
    }
    else if (typeof date === "number") {
        dDate = new Date(date);
    }
    else if (date instanceof Date) {
        if (timeZone && timeZone !== getTimeZone()) {
            dDate = new Date(date.getTime() - getTimeZoneOffset(date, timeZone));
        }
        else {
            dDate = date;
        }
    }
    else {
        const sDate = date.toString();
        dDate = parseISO(sDate);
        if (!isValid(dDate)) {
            return sDate;
        }
        if (timeZone && timeZone !== getTimeZone()) {
            dDate = new Date(dDate.getTime() - getTimeZoneOffset(dDate, timeZone));
        }
    }
    const locale = options?.locale ?? (/^ja(-|$)/i.test(getLocale()) ? ja : enUS);
    if (locale.code && /^ja-JP-u-ca-japanese$/i.test(locale.code)) {
        const era = JapaneseEra.of(dDate);
        if (era) {
            const dFormat = DateFormat.get(format);
            const parts = [...dFormat.parts];
            for (let i = 0; i < parts.length; i++) {
                const part = parts[i];
                if (part.type === "pattern") {
                    if (part.text.startsWith("G")) {
                        if (part.text.length <= 3) {
                            parts[i] = {
                                type: "quoted",
                                text: `'${era.toLocaleString(locale.code, { style: "short" })}'`,
                            };
                        }
                        else if (part.text.length === 4) {
                            parts[i] = {
                                type: "quoted",
                                text: `'${era.toLocaleString(locale.code, { style: "long" })}'`,
                            };
                        }
                        else {
                            parts[i] = {
                                type: "quoted",
                                text: `'${era.toLocaleString(locale.code, { style: "narrow" })}'`,
                            };
                        }
                    }
                    else if (part.text.startsWith("y")) {
                        const gYear = dDate.getFullYear() - era.start.getFullYear() + 1;
                        if (part.text.length === 1) {
                            parts[i] = { type: "quoted", text: `'${gYear}'` };
                        }
                        else if (part.text.endsWith("o")) {
                            parts[i] = { type: "quoted", text: `'${gYear}年'` };
                        }
                        else {
                            parts[i] = {
                                type: "quoted",
                                text: `'${"0".repeat(part.text.length - gYear.toString().length)}${gYear}'`,
                            };
                        }
                    }
                }
            }
            format = new DateFormat(parts).toString();
        }
    }
    try {
        return _format(dDate, format, { locale });
    }
    catch (err) {
        if (err instanceof RangeError) {
            return date.toString();
        }
        else {
            throw err;
        }
    }
}