Discount Date Range Removes Discount the Date Before the End Date

Anytime Date Range is used for Discounts the Discount has always disappeared the day before the End Date of the Discount. We constantly have to remind people to mark the end date to be the day after the true end date, but this continually gets missed. 

Last time I reported this I was told that it was not possible to fix, but I think this needs to be looked at again, and even if it isn't technically feasible to fix at least add a disclaimer so the person making the discount can be reminded while making it so that the site doesn't run into unexpected issues when that day comes.