ddd DD is an invalid format whereas DD, ddd, and ddd YYYY are valid

[ashwin-mittal]

Describe the bug
I am getting an invalid moment object for ddd DD format but valid for DD, ddd, and ddd YYYY.

To Reproduce
Steps to reproduce the behavior:

• I am creating a moment object in UTC for 2015-01-10T01:15Z and converting it into DD, ddd and ddd YYYY format using the format method.
• Now I converted them back to moment object using non strict parsing for all those formats and got the following results:

ddd Sat true
DD 10 true
ddd DD Sat 10 false
ddd MM Sat 01 false

Expected behavior
Expected behavior would be that ddd DD should also return a valid moment.

Desktop (please complete the following information):

• OS: macOS Sonoma 14.4.1

Moment-specific environment

• The time zone setting of the machine the code is running on: IST
• The time and date at which the code was run: UTC
• Other libraries in use (TypeScript, Immutable.js, etc): No

Please run the following code in your environment and include the output:

console.log((new Date()).toString())
console.log((new Date()).toLocaleString())
console.log((new Date()).getTimezoneOffset())
console.log(navigator.userAgent)
console.log(moment.version)

Output:

Sun Apr 07 2024 20:24:20 GMT+0530 (India Standard Time)
4/7/2024, 8:24:20 PM
-330
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36
2.30.1

Additional context
The code I used to reproduce the issue:

const moment = require('moment');

const formats = ['ddd', 'DD', 'ddd DD', 'ddd YYYY']
for(let format of formats) {
    const d = moment.utc('2015-01-10T01:15Z').format(format)
    console.log(format, d, moment(d, format).isValid())
}