I'm glad that Sitecore is now aware of the bug and it will provide a official fix
I made a blog about this a couple months ago with the detailed Discussion and the research of the issue
I will also update my blog post with this version provided from Sitecore
Sitecore doesn't have such a functionality OOTB .
You can have 2 different DateTime fields and you can add them in a single section of the template or you can build your own custom field to look exactly on your screenshot.
I prefer the first variant because the second one with custom field needs to be upgraded for the future upgraded of the platform.
Something like that is not possible out of the box. You will need to write some custom code. Try something like that:
1) Disable the second datepicker
2) Use following code to enable the second datepicker when any date will be selected:
// Example options - modify as you need
According to the help desk, yes you still have to edit the file.
\sitecore\shell\client\Business Component Library\Layouts\Renderings\Common\DatePickers\DatePicker.js
But instead of fixing the hard-coded date format to your desired format, update this line:
The side-by-side date is not available OOTB in Sitecore. you can create a custom field for this requirement where you can design your side-by-side date field.
Here is the link to create a custom field: