Invalid parsing

[kverty]

Describe the bug
dayjs function ignores provided format.

let test = dayjs('12/01/1996', 'DD/MM/YYYY')

console.log(test.format())

// "1996-12-01T00:00:00+03:00"

Expected behavior
Expected result is "1996-01-12T0:00:00+03:00"

Information

• Day.js Version: 1.11.11
• OS: Windows 11
• Browser: chrome, 64 bit
• Time zone: GMT+03:00
• I just run it in jsfiddle

[jorgefo]

I have the same issue

let test = dayjs('03-04-2024', 'DD-MM-YYYY');
console.log(test.toDate()); 
// 2024-03-04T03:00:00.000Z 
// the correct is 2024-04-03T03:00:00.000Z

Information

• Day.js Version: 1.11.11
• OS: MacOs
• Browser: chrome, 64 bit
• Time zone: GMT+03:00

[joaoGabriel55]

Did you import custom-parse-format?

[tonytkachenko]

Custom parse format not working correctly.

const date = dayjs("13-12-1999", { format: "DD-MM-YYYY" }, true); // treats 13 as month

Check this:
https://runkit.com/embed/w7op0120g88z