@technobuddha/library/dist/get-iso-week-of-year.js

A large library of useful functions

import { day, month, ticksPerWeek } from "./constants.js";
import { floor } from "./floor.js";
import { getBeginningOfWeek } from "./get-beginning-of-week.js";
import { getISOWeeksInYear } from "./get-iso-weeks-in-year.js";
/**
 * Determine the ISO week number for a given date
 *
 * @param input - The date
 * @param options - see {@link ISOWeekOfYearOptions}
 * @defaultValue weekOneIncludes Thursday
 * @defaultValue firstDayOfWeek Monday
 * @returns the week number (1-53)
 * @group Time
 * @category Week
 */
export function getISOWeekOfYear(input, { utc = false, weekOneIncludes = day.thursday, firstDayOfWeek = day.monday, } = {}) {
    const bow = getBeginningOfWeek(input, { utc, firstDayOfWeek });
    const week1 = utc ?
        getBeginningOfWeek(new Date(Date.UTC(bow.getUTCFullYear(), month.january, weekOneIncludes)), {
            utc,
            firstDayOfWeek,
        })
        : getBeginningOfWeek(new Date(bow.getFullYear(), month.january, weekOneIncludes), {
            utc,
            firstDayOfWeek,
        });
    let week = 1 + floor((bow.getTime() - week1.getTime()) / ticksPerWeek, { tolerance: 0.05 });
    let year = utc ? bow.getUTCFullYear() : bow.getFullYear();
    const weeks = getISOWeeksInYear(year, { utc, weekOneIncludes });
    if (week > weeks) {
        year += 1;
        week = 1;
    }
    return { year, week };
}
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