SharePoint List Date Format Not Matching Site Locale Setting

I'm having the same issue. Also in Canada. Also seeing American MM/DD/YY format instead of yyy-mm-dd format that we have used for years. I don't recall the date-picker popup until a month or so ago. Now the popup is there and changes the date field to the wrong format and prevents saving the date (incorrect fromat). if a user (understandibly) mistakenly beleives that the popup can be used to select a date, they waste their time and pull our their hair until they have been given instructions to "press esc when the popup appears and manually type the date in yyyy-mm-dd format". This is a rediculous bug. Obviously only techs in USA tested the changes they made to date picker before implimenting. We need this fixed. Very frustrating for all my non-techy users and techy users alike.