Unlike 02/02/2020, 12/02/2021 will not be a 'globally' palindromic day, as it doesn't represent a single day, but 12th Feb in some places and 2nd December in others.

Easter is sometimes on the same date but at other times on a different date for Western and Orthodox Christians, depending on how it is calculated. 12/02/2020 will be a palindromic date for everyone but, like Easter, will be noted at different times of the year, according to local calculations. I think that qualifies it as 'global'.

The convention for writing numbers is, left to right, highest to lowest. i.e. thousands > hundreds > tens > units.

In the 24 hour system, time is written: hours > minutes > seconds.

The year itself is written: millennium > century > decade > year.

Logically, dates should be written: year > month > day. Under this system, 2020/02/02 would still be a palindrome but the next one would be 22 months away, on 2021/12/02.

DC