(1) In the spec, an interval value or literal must be either year-month or day-time. (I guess they didn't want to try to deal with the sticky issues of what it means to have an interval of, for example, seven months and three days -- since an interval has no sense of which seven months.)
Note that, for usability reasons, Karel some time ago try-partitioned our intervals: year-month|day-week|hour-min-sec.
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