>>>Hey everybody,
>>>
>>>are you aware that today is a very special day? In Europe we use dd-mm-yyyy for dates, so today is 22-02-2022. If you remove the dash, you end up with 22022022 which is a palindrome. So, happy palindrome day, everyone.
>>
>>Not exactly everyone, there are the Americans...
>
>I don't think it's proper to write "Happy palindrome day, everyone, except Americans"...

You could soften it a bit:
"Happy palindrome day, everyone, except Americans and Nerds"
{^2022.02.22}, or 220222 in shorthand Excel for instance
BUT
at least in shorthand Nerds will get one in Nov 22nd this year
with most Europeans using short dates