How to format a ZonedDateTime to a String?

You can use java.time.format.DateTimeFormatter.
https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html

Here there is an example

ZonedDateTime date = ZonedDateTime.now();

System.out.println(DateTimeFormatter.ofPattern("dd/MM/yyyy - hh:mm").format(date));