'ZonedDateTime format and parsing exception with “z” in format pattern

I have a problem with parsing ZonedDateTime:

DateTimeFormatter format = DateTimeFormatter.ofPattern("yyyy-MM-ddzhh:mm");
ZonedDateTime.parse(s, formatter);

This results in an error:

java.time.format.DateTimeParseException:
    Text '2022-05-24UTC12:15' could not be parsed at index 10

whats wrong with this code?

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