dayjs format 'YYYY-ww' error

[a145789]

Describe the bug

<script src="https://unpkg.com/dayjs@1.11.4/dayjs.min.js"></script>
<script src="https://unpkg.com/dayjs@1.11.4/plugin/weekOfYear.js"></script>
<script src="https://unpkg.com/dayjs@1.11.4/plugin/weekYear.js"></script>
<script src="https://unpkg.com/dayjs@1.11.4/plugin/advancedFormat.js"></script>
<script src="https://unpkg.com/dayjs@1.11.4/plugin/customParseFormat.js"></script>

<script>
  dayjs.extend(window.dayjs_plugin_advancedFormat)
  dayjs.extend(window.dayjs_plugin_customParseFormat)
  dayjs.extend(window.dayjs_plugin_weekOfYear)
  dayjs.extend(window.dayjs_plugin_weekYear)
  var date = dayjs("2022-31", "YYYY-ww").toDate()
  console.log(date); // Sat Jan 01 2022 00:00:00 GMT+0800 (中国标准时间)
  console.log(dayjs(date).format('YYYY-ww')); // 2022-01

</script>

Expected behavior

  console.log(dayjs(date).format('YYYY-ww')); // 2022-31

Information

• Day.js Version [e.g. v1.11.4]
• Browser [e.g. chrome 103.0.5060.134]
• Time zone: [e.g. GMT-07:00 DST (Pacific Daylight Time)]

[Bykiev]

Hi, according to the docs ww is not a valid parsing token, that's why it's not working.