Parsing dates with a named day of the week fails.

[Orbyt]

Describe the bug
Parsing dates with a named day of the week fails. However, switching the function to call moment works as expected.

const dayjs = require('dayjs')
// Multiple plugins were tested.
let weekday = require('dayjs/plugin/weekday')
let customParseFormat = require('dayjs/plugin/customParseFormat')
let localeData = require('dayjs/plugin/localeData')
let localizedFormat = require('dayjs/plugin/localizedFormat')
let updateLocale = require('dayjs/plugin/updateLocale')
let utc = require('dayjs/plugin/utc')
dayjs.extend(weekday)
dayjs.extend(localeData)
dayjs.extend(customParseFormat)
dayjs.extend(localizedFormat)
dayjs.extend(updateLocale)
dayjs.extend(utc)

// Prints `false`.
console.log(dayjs('Wednesday, December 30th 2020 (6:00 pm)', 'dddd, MMMM Do YYYY (h:mm a)').isValid()) 

// Prints `true`.
var moment = require('moment');
console.log(moment('Wednesday, December 30th 2020 (6:00 pm)', 'dddd, MMMM Do YYYY (h:mm a)').isValid()) 

Information

• Day.js Version 1.9.8
• OS: macOS - Node.js
• Time zone: Pacific

[Orbyt]

#576 appears to have been an attempt to fix a similar issue, but it was never merged.

[ssergeyyy]

I have the same problem. Any news on this fix? Or is the best way to avoid using dddd with customParseFormat?

[huypxgear]

I have the same problem. Is there anyway to validate weekday format

[BePo65]

You have 2 problems

1. 'dddd' is similar to the issue Loading the customParseFormat plugin causes parsing some formats to return invalid dates #1802 - dayjs (and moment too) don't have a dddd parsing format
   This should be a feature request
2. and the commas in the format are similar to the issue Fix issue #1852 - comma not recognized as a separator character #1913 - dayjs does not accept the comma as a separator character.
   This would be fixed with PR Fix issue #1852 - comma not recognized as a separator character #1913