Update doc

CHANGELOG.md

@@ -10,7 +10,7 @@ Compare with [last published version](https://github.com/meduzen/datetime-attrib
 
 ### Fixed
 
-- Fix incorrect year for `datetime(date, 'week')` when the week started the previous year. For example, `2021-01-01` is a Friday and its week belongs to 2020 (as [per spec](./README.md#weeknumber). In that case, the output was `2021-53` instead of `2020-53`.
+- Fix incorrect year for `datetime(date, 'week')` when the week started the previous year. For example, `2021-01-01` is a Friday and its week belongs to 2020 (as [per spec](./README.md#weeknumber)). In that case, the output was `2021-53` instead of `2020-53`.
 
 ### Improved
 

src/datetime.test.js

@@ -106,7 +106,7 @@ describe('datetime', () => {
       expect(datetime(january19th, 'week')).toBe('2021-W03')
     })
 
-    // 1st day of the month is after Thurdsay
+    // 1st day of the month is after Thurdsay, but it’s not in January
     test('week on 2021-03-01 is 2021-W17', () => {
       const march1st2021 = new Date(2021, 4, 1)
       expect(getNormalizeDay(march1st2021)).toBeGreaterThan(4)

src/utils/date.js

@@ -35,7 +35,7 @@ export function daysBetween(date, furtherDate) {
  * @returns {number}
  */
 export function weekNumber(date) {
-  const dayIndex = getNormalizeDay(date) // normalize index because Sunday == 0
+  const dayIndex = getNormalizeDay(date)
 
   const sameWeekThursday = new Date(date)
   sameWeekThursday.setDate(date.getDate() + 4 - dayIndex)
@@ -47,7 +47,7 @@ export function weekNumber(date) {
 }
 
 /**
- * Get the day index of the week, except Sunday is 7 instead of 0.
+ * Get the day index of the week, but Sunday is now 7 instead of 0.
  *
  * @param {Date} date
  * @returns {number}