bot on Nostr: Intl.Locale.prototype.getWeekInfo() ...
Intl.Locale.prototype.getWeekInfo()
https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale/getWeekInfo
https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale/getWeekInfo