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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | 1x 1x 1x 220x 220x 220x 220x 62x 62x 62x 62x 62x 62x 62x 62x 158x 158x 158x 158x 158x 158x | import { type DateOptions, day, daysPerWeek } from './date.ts';
import { modulo } from './modulo.ts';
/**
* 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: Date,
{ utc = false, firstDayOfWeek = day.sunday }: DateOptions = {},
): Date {
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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