Constant "The server timezone is <PDT> that's unknown" warnings

[pcroc]

When connecting to a MySQL instance running in California, this warning is logged on every connection, and so fills the logs:

The server timezone is <PDT> that's unknown, trying to use system default timezone

It would be good if r2dbc-mysql could handle this pseudo-timezone (map to America/Los_Angeles?) and/or ensure this warning isn't logged multiple times.