🐛 The customParseFormat plugin doesn't handle Dayjs, Date, and number types properly.

[av-k]

Describe the bug
The dayjs function itself (except Dayjs type in case dayjs() call works properly) and utc plugin and customParseFormat, does not work as expected. It fails to handle certain input types correctly. A demo showcasing the issue can be found here.

Expected behavior
The customParseFormat plugin should handle Dayjs, Date, and number input types correctly, just as it does for string types.

Information

• Day.js Version: v1.11.13
• OS: Fedora 6.10.12-100.fc39.x86_64
• Browser: Chrome Version 129.0.6668.89 (Official Build) (64-bit)
• Time zone: Berlin (GMT+2)