Because in short, it's alphabetical. It will always be in order by year, then month, then day. Literally like how a clock goes HH:MM:SS it's the same thing as YY:MM:DD the right side ticks the fastest. It's in order by hour (year) then minute (month) then second (day). SAME SAME WHY NOT
A proper date sort would be YYYYMMDD
Because in short, it's alphabetical. It will always be in order by year, then month, then day. Literally like how a clock goes HH:MM:SS it's the same thing as YY:MM:DD the right side ticks the fastest. It's in order by hour (year) then minute (month) then second (day). SAME SAME WHY NOT