Thanks for the info. I uploaded a new snapshot #3 with the date time fix, plus the isCorrectDatabaseImplementation logic is now:
StringUtils.trimToEmpty(System.getProperty("liquibase.ext.redshift.force")).equalsIgnoreCase("true")
|| conn.getURL().contains(".redshift.")
|| conn.getURL().contains(":5439");
so something with bla-bla.us-east-1.redshift.amazonaws.com or on port 5439 will work and if you are running on a non-default port and a non-default hostname, you can force it with a liquibase.ext.redshift.force system property.
Nathan