so what exactly is the spec for `TIMESTAMP` columns? I've got a column defined as `created_at TIMES

so what exactly is the spec for TIMESTAMP columns?

I've got a column defined as created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, and that produces values like 2023-10-16 15:56:51, but what actual format is that so I can convert to ISO 8601-1:2019 properly?
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