vremel/dist/datetime/startOfYear.js

JavaScript date utility library for Temporal API

import { isPlainDate, isPlainYearMonth, isZonedDateTime, } from "../type-utils.js";
import { startOfTimeForZonedDateTime } from "./_startOfTimeForZonedDateTime.js";
/**
 * Returns the start of a year for the given datetime
 * @param dt datetime object which includes date info
 * @returns Temporal object which represents the start of a year
 */
export function startOfYear(dt) {
    if (isPlainYearMonth(dt)) {
        return dt.with({ month: 1 });
    }
    if (isPlainDate(dt)) {
        return dt.with({ month: 1, day: 1 });
    }
    const withArg = {
        month: 1,
        day: 1,
        hour: 0,
        minute: 0,
        second: 0,
        millisecond: 0,
        microsecond: 0,
        nanosecond: 0,
    };
    if (!isZonedDateTime(dt)) {
        return dt.with(withArg);
    }
    return startOfTimeForZonedDateTime(dt, withArg);
}
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