Now I'm wondering where the output format is defined.

A quick look at the documentation: sections 8.5.2. Date/Time Output and 19.11.2. Locale and Formatting appear to discuss this.

I would have to change each and every select statement to have a TO_CHAR with the proper format.

This StackOverflow answer suggests defining a function to curry the arguments.

In another piece of code I have lying around that uses Mojo::Pg, I use DateTime::Format::Strptime to parse the date strings coming from Postgres and DateTime's strftime to format them, though I suspect that's going to be less efficient than letting the database handle it.

In reply to Re: What defines the output format of a Postgres Timestamp by haukex
in thread What defines the output format of a Postgres Timestamp by Skeeve

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