@technobuddha/library
Version:
A large library of useful functions
35 lines • 3.14 kB
JavaScript
import { beginningOfWeek } from "./beginning-of-week.js";
import { day, month, ticksPerWeek } from "./date.js";
import { floor } from "./floor.js";
import { isoWeeksInYear } from "./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 isoWeekOfYear(input, { utc = false, weekOneIncludes = day.thursday, firstDayOfWeek = day.monday, } = {}) {
const bow = beginningOfWeek(input, { utc, firstDayOfWeek });
const week1 = utc ?
beginningOfWeek(new Date(Date.UTC(bow.getUTCFullYear(), month.january, weekOneIncludes)), {
utc,
firstDayOfWeek,
})
: beginningOfWeek(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 = isoWeeksInYear(year, { utc, weekOneIncludes });
if (week > weeks) {
year += 1;
week = 1;
}
return { year, week };
}
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