No, what I am sayiong is that when you do it via the web GUI it adds the command:
clock summer-time summer-time repeating 02:00:00 2017 March last Sunday 01:00:00 2017 October last Sunday 01:00:00
(i.e. it adds the current year to the start and end dates).
However, if I try to change the end year to anything later via the CLI, it gives the error:
% End-time must be later than start-time, and the time range determined cannot be shorter than one day nor longer than one year.