DatePicker 1.4.4 disabledDate fixes are not complete (fix provided)

[remzmike]

Element UI version

0.1.0

OS/Browsers version

Windows 10, Firefox/Chrome

Vue version

2.3.4

Reproduction Link

https://gist.github.com/remzmike/41de4e999addc6be195ab9bcf86628fc

Steps to reproduce

https://gist.github.com/remzmike/41de4e999addc6be195ab9bcf86628fc

What is Expected?

DatePicker disabledDate works

What is actually happening?

It doesn't

[remzmike]

DatePicker changes in 1.4.4 are not correct.

See my comments here:
#6768

Or just look at the fix:
https://gist.github.com/remzmike/41de4e999addc6be195ab9bcf86628fc
https://gist.github.com/remzmike/a06aaa7a8460b3c58f199b4bc68e9ef7

[glittle]

Also see this JSFiddle https://jsfiddle.net/kpnvgqcn/.

None of the days in this year can be selected, yet it looks like some can be used.

[Leopoldthecoder]

@remzmike Could you write a demo of this bug?

@glittle I'm sorry but your demo works fine on my Chrome. Is there anything I need to do to reproduce this?

[remzmike]

@Leopoldthecoder

Please read my comments here for the most complete details I have provided:
#6768

I don't have time to write a demo. I'm not the first person to report this and it was supposedly already fixed, but this simple code shows why the previous fix does not work and will never work.

d = new Date(0);
d.setFullYear(2017);
d.setMonth(8);
// > Sun Oct 01 2017 19:00:00 GMT-0400 (Eastern Daylight Time)
d.setMonth(8);
// > Fri Sep 01 2017 19:00:00 GMT-0400 (Eastern Daylight Time)

[Leopoldthecoder]

This turns out to be an interesting bug. A bug that only exists in the west hemisphere. That's why I didn't reproduce it in the demo written by @glittle .

Fixed in #7114