Backdrop really ought to have, or be able to have, placeholders for admin form inputs. More and more designers hide form labels and rely on placeholders to provide information in a clean manner.
Perhaps the easiest place to visual this working is on the User registration/login and password forms. Here's an example:
Whilst it's feasible to add placeholders per input field and form through your theme template.php file, surely we should be taking full advantage of HTML5's features and have this in core for all admin forms?

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Thanks, but that makes no difference. I enter Today as the end, Apply, it ignores it, and I still have just the one date selector.
Between Dates Views Filter not functioning as expected
But when setting End Date, and relative of -0 days or -1 days... Instead of "-0 days" use today and instead of -1 days use yesterday. Find some background re relative...
Between Dates Views Filter not functioning as expected
Worth mentioning as it was in zulip chat by @yorkshirepudding I just tested and the two work together without issue as long as you don't use the "Exclude comments from Content...
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