softwareheritage=> select now() at time zone interval '00:00';
timezone
----------------------------
2020-05-24 13:31:01.133371
(1 row)
softwareheritage=> select now() at time zone interval ('00:' || '00');
ERROR: syntax error at or near "'00:'"
LINE 1: select now() at time zone interval ('00:' || '00');
^
softwareheritage=>