I find the screenshot showing two columns - 4/22/2014 and 4/21/2014 - culturally interesting (I'm from Australia, but see this date format frequently).

You kind of take it for granted that everyone (else) in IT, especially those who produce something used by foreigners, ie. the makers of any web app, will have already embraced 8601. Or, at the very least, offer this as a locale / display option for their users, even if they themselves use an unsortable, ambiguous, region-specific format inside their own systems.

One of the very few things that continues to frustrate me with Trello is that every date shown to me is locked in the format "Mmm dd, yyyy at hh:mm", with no facility to modify that.