[conqrr]

This one does make sense. I haven't read it yet, but I always write the full year. For 2020, if you abbreviate it as just 20, adding two more digits allows anyone to fake a future date into 79 years (2021, 2022.. 2099) etc However in the past, this would have been avoided since abbreviating 2019 as 19 and adding two digits would move you into the past which wont make sense always.

[lukeholder]

Moving a date into the past or the future can both be just as disruptive, depending on the application.