@technobuddha/library
Version:
A large library of useful functions
18 lines • 1.84 kB
JavaScript
import { day, daysPerWeek } from "./date.js";
import { modulo } from "./modulo.js";
/**
* Determine the start of the week for a date
* @param input - The date
* @param options - see {@link DateOptions}
* @defaultValue utc false
* @returns The date value for midnight on the first day of the specified week
* @group Time
* @category Week
*/
export function beginningOfWeek(input, { utc = false, firstDayOfWeek = day.sunday } = {}) {
if (utc) {
return new Date(Date.UTC(input.getUTCFullYear(), input.getUTCMonth(), input.getUTCDate() - modulo(input.getUTCDay() + daysPerWeek - firstDayOfWeek, daysPerWeek)));
}
return new Date(input.getFullYear(), input.getMonth(), input.getDate() - modulo(input.getDay() + daysPerWeek - firstDayOfWeek, daysPerWeek));
}
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