Perhaps the type of a base table column/domain should be temporal (based on default values)

Copy SQL

WITH columns AS (SELECT A.table_schema AS schema, A.table_name, A.column_name AS object, A.data_type, a.column_default AS default_value, 'COLUMN' AS object_type
FROM information_schema.columns A INNER JOIN information_schema.schemata S ON A.table_schema=S.schema_name
WHERE A.data_type IN ('character varying','text','character') 
AND A.column_default~*'(localtimestamp|current_timestamp|localtime|current_time|current_date|now|[[:digit:]]{4}(-|/|\|.)[[:digit:]]{1,2}(-|/|\|.)[[:digit:]]{1,2}|[[:digit:]]{1,2}(-|/|\|.)[[:digit:]]{1,2}(-|/|\|.)[[:digit:]]{4}|[[:digit:]]{1,2}:[[:digit:]]{1,2})'
AND (A.table_schema = 'public'
OR S.schema_owner<>'postgres')
AND (table_schema, table_name) IN (SELECT table_schema, table_name
FROM information_schema.tables
WHERE table_type='BASE TABLE')),
domains AS (SELECT D.domain_schema AS schema, NULL AS table_name, D.domain_name AS object, D.data_type, D.domain_default AS default_value, 'DOMAIN' AS object_type
FROM information_schema.domains D INNER JOIN information_schema.schemata S ON D.domain_schema=S.schema_name
WHERE D.data_type IN ('character varying','text','character') 
AND D.domain_default~*'(localtimestamp|current_timestamp|localtime|current_time|current_date|now|[[:digit:]]{4}(-|/|\|.)[[:digit:]]{1,2}(-|/|\|.)[[:digit:]]{1,2}|[[:digit:]]{1,2}(-|/|\|.)[[:digit:]]{1,2}(-|/|\|.)[[:digit:]]{4}|[[:digit:]]{1,2}:[[:digit:]]{1,2})'
AND (D.domain_schema = 'public'
OR S.schema_owner<>'postgres'))
SELECT schema, table_name, object, object_type, data_type, default_value
FROM columns
UNION SELECT schema, table_name, object, object_type, data_type, default_value
FROM domains
ORDER BY schema, object_type, object;