Weekday Names
Locale#weekdayjs 应该是一个包含星期名称的数组。
这依赖
UpdateLocale
插件，才能正常运行
dayjs.extend(updateLocale)
dayjs.updateLocale('en', {
weekdays: [
"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
]
})