What format does the Standard mandate for a time interval?
There are several to choose from. A time interval can be specified as a starting time and an ending time or as a duration together with either a starting time and an ending time. There are too many details to cover, so here are a few examples: Using starting time and ending time: 1998-12-01T12:03/2004-04-02T14:12 Using starting time and duration: 1927-03-12T08:04/P1Y4M12DT6H30M9S This last example should be read as the time interval starting on 12 March 1927 at 08:04 and lasting for 1 year, 4 months, 12 days, 6 hours, 30 minutes, and 9 seconds. The letter P following the slash indicates that a duration follows.
