After upgrading a host’s operating system we ran into this error on a Magento site:

There has been an error processing your request

datefmt_create: no such time zone: 'UTC': U_ILLEGAL_ARGUMENT_ERROR

After much debugging it turned out that the version of ICU inside the PHP-FPM chroot had not been updated.

Updating the chroot copies of the ICU libraries resolved the problem.

Hope this helps someone else get to the bottom of this quickly!

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