Manipulating days with decimal numbers ignores hours

Describe the bug When manipulating a date with unit type day and an arbitrary decimal number does not manipulate the time of the date.

Expected behavior The time is manipulated as well.

Information Stackblitz reproduction: https://stackblitz.com/edit/js-akaprq?file=index.js

[Bykiev]

Thanks for your elaborations. I agree that the docs need to at least warn the user about this behavior. I can also understand why you want to behave dayjs the same as momentjs but at some point you have to consider removing bugs that moment had and I would consider this clearly as a bug since most other units are able to subtract/add decimal values. A fix in dayjs 2.0 would be OK. We implemented a workaround for now.

It’s not a bug in moment.js, see explanation here: https://github.com/moment/moment/issues/2430#issuecomment-113832948.

[BePo65]

Of course you are right. IMO one of the basic definitions for dayjs is that it behaves just like moment (ok, there are a few exceptions 😃. In this regard this is at least another difference.

But as this would be a breaking change (if not of the documentation that says nothing about it, so at least regarding the functionality), perhaps this should become an action point for dayjs 2.0.

@iamkun is there a place, where those requirements for dayjs 2.0 could be documented?

PS: @Bykiev you are pretty fast responding to issues 🥇 👍 😄