12.2. Date, Time, and Duration Datatypes
The Schema Recommendation introduces a number of datatypes related to dates and times. They can be partitioned naturally into three groups:
Individual points on the “time line”: dates, with and without times
Lengths of intervals on the time line: durations
Sets of points on the time line, modulo some interval: repeating times
In this respect, the time line is much like the “number line” used to describe real numbers (and Schema’s decimal, for that matter).
Think of a continuous number line: One point is the origin; another is “one year” to the right. Think of the origin as the moment at the boundary of the year A.D. 1 and the year 1 B.C. and the other point as the moment at the boundary of A.D. 1 and
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