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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 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | 1x 1x 1x 1x 1x 96x 96x 96x 96x 96x 96x 96x 96x 96x 96x 24x 24x 24x 24x 72x 72x 72x 72x 96x 96x 96x 96x 1x 1x 1x 96x 96x | import { beginningOfWeek } from './beginning-of-week.ts';
import { day, type DayOfWeek, month, ticksPerWeek } from './date.ts';
import { floor } from './floor.ts';
import { isoWeeksInYear } from './iso-weeks-in-year.ts';
/**
* Options for the {@link isoWeekOfYear} function
* @group Time
* @category Week
*/
export type ISOWeekOfYearOptions = {
/** Use the utc timezone */
utc?: boolean;
/** Week 1 is defined as the week with the Gregorian year's first [weekOneIncludes] day in it */
weekOneIncludes?: DayOfWeek;
/** The first day of the week */
firstDayOfWeek?: DayOfWeek;
};
/**
* 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: Date,
{
utc = false,
weekOneIncludes = day.thursday,
firstDayOfWeek = day.monday,
}: ISOWeekOfYearOptions = {},
): {
/** The year */
year: number;
/** The ISO week number */
week: number;
} {
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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