Holidays
A palindrome date reads the same forwards and backwards as a string of digits. Find the next one in whichever date format you use.
A date is a palindrome only as a specific string of digits, and different regions write the same date differently — so a date that's a palindrome in ISO format (YYYY-MM-DD) usually isn't one in US format (MM/DD/YYYY), and vice versa. That's why 02/02/2020 was widely celebrated as a palindrome date in the US, while a different date entirely is the next ISO-format palindrome.
In ISO format, true 8-digit palindrome dates are rare because the year's last two digits have to mirror the day, and the month has to mirror the first two digits of the year — a fairly restrictive constraint that produces only a handful of valid calendar dates per century.
Related
What day of the week any specific date falls on.
Another calculated calendar curiosity.
See any date written in every common format at once.