vremel/dist/datetime/toDateFromClockTime.js

JavaScript date utility library for Temporal API

import { UTCDate } from "@date-fns/utc";
import { isPlainDate, isPlainMonthDay, isPlainTime, isPlainYearMonth, isZonedDateTime, } from "../type-utils.js";
function parseIsoString(date) {
    const res = /^(\d{4,})-(\d{2})-(\d{2})/.exec(date);
    if (res === null) {
        throw new Error("Invalid format");
    }
    const [, y, m, d] = res;
    if (y === undefined || m === undefined || d === undefined) {
        throw new Error("Invalid format");
    }
    return {
        year: parseInt(y, 10),
        month: parseInt(m, 10),
        day: parseInt(d, 10),
    };
}
export function toDateFromClockTime(dateTime, DateConstructor) {
    const DateConstructorFunction = DateConstructor ?? UTCDate;
    if (isPlainYearMonth(dateTime)) {
        const pd = dateTime.toPlainDate({ day: 1 }).withCalendar("iso8601");
        return new DateConstructorFunction(pd.year, pd.month - 1, pd.day);
    }
    if (isPlainMonthDay(dateTime)) {
        if (dateTime.calendarId === "iso8601") {
            const pd = dateTime.toPlainDate({ year: 1972 });
            return new DateConstructorFunction(pd.year, pd.month - 1, pd.day);
        }
        const { year, month, day } = parseIsoString(dateTime.toString());
        return new DateConstructorFunction(year, month - 1, day);
    }
    if (isPlainTime(dateTime)) {
        // Set default date to 2000-01-01
        return new DateConstructorFunction(2000, 0, 1, dateTime.hour, dateTime.minute, dateTime.second, dateTime.millisecond);
    }
    const plainDateTime = isZonedDateTime(dateTime) ?
        dateTime.toPlainDateTime().withCalendar("iso8601")
        : isPlainDate(dateTime) ? dateTime.toPlainDateTime().withCalendar("iso8601")
            : dateTime.withCalendar("iso8601");
    return new DateConstructorFunction(plainDateTime.year, plainDateTime.month - 1, plainDateTime.day, plainDateTime.hour, plainDateTime.minute, plainDateTime.second, plainDateTime.millisecond);
}
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