is there an immutable function to switch from date to character?

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From: Celia McInnis <[email protected]>
To: pgsql-generallists.postgresql.org <[email protected]>
Subject: is there an immutable function to switch from date to character?
Date: Wed, 24 Apr 2024 17:31:00 -0400
Message-ID: <CAGD6t7+GykxBs=BVeg2un_rQOrjXz==pXt-UWFVTNCgeYCSB5A@mail.gmail.com> (raw)

create temporary table junk as select now()::date as evtdate;

alter table junk add column chardate text GENERATED ALWAYS AS
(to_char(evtdate,'YYYY-Mon-DD')) STORED;

ERROR:  generation expression is not immutable

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