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
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
import { DAY, WEEK } from "./constants.ts";
const DAYS_PER_WEEK = 7;
const Day = {  Sun: 0,  Mon: 1,  Tue: 2,  Wed: 3,  Thu: 4,  Fri: 5,  Sat: 6,} as const;
/** * Returns the ISO week number of the provided date (1-53). * * @param date Date to get the week number of. * @returns The week number of the provided date. * * @example Basic usage * ```ts * import { weekOfYear } from "https://deno.land/std@$STD_VERSION/datetime/week_of_year.ts"; * * weekOfYear(new Date("2020-12-28T03:24:00")); // 53 * * weekOfYear(new Date("2020-07-10T03:24:00")); // 28 * ``` */export function weekOfYear(date: Date): number {  const workingDate = new Date(    Date.UTC(date.getFullYear(), date.getMonth(), date.getDate()),  );
  const day = workingDate.getUTCDay();
  const nearestThursday = workingDate.getUTCDate() +    Day.Thu -    (day === Day.Sun ? DAYS_PER_WEEK : day);
  workingDate.setUTCDate(nearestThursday);
  // Get first day of year  const yearStart = new Date(Date.UTC(workingDate.getUTCFullYear(), 0, 1));
  // return the calculated full weeks to nearest Thursday  return Math.ceil((workingDate.getTime() - yearStart.getTime() + DAY) / WEEK);}