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Wikipedia gives an example of an ISO 8601 example of a repeating interval:
R5/2008-03-01T13:00:00Z/P1Y2M10DT2H30M
This is what this means:
R5 means that the interval after the slash is repeated 5 times.2008-03-01T13:00:00Z means that the interval begins at this given datetime.P1Y2M10DT2H30M means that the interval lasts for
My problem is that I do not know exactly what is being repeated here. Does the repetition occur immediately after the interval ends? Can I specify that every Monday something happens from 13:00 to 14:00?
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Briefly, the ISO 8601 notation consists of a P character, followed by years, months, weeks, and days, followed by a T character, followed by hours, minutes, and seconds with a decimal part, each with a single-letter suffix that indicates the unit. Any zero components may be omitted.
Date.prototype.toISOString() The toISOString() method returns a string in simplified extended ISO format (ISO 8601), which is always 24 or 27 characters long ( YYYY-MM-DDTHH:mm:ss.sssZ or ±YYYYYY-MM-DDTHH:mm:ss.sssZ , respectively). The timezone is always zero UTC offset, as denoted by the suffix Z .
ISO 8601 Formats ISO 8601 represents date and time by starting with the year, followed by the month, the day, the hour, the minutes, seconds and milliseconds. For example, 2020-07-10 15:00:00.000, represents the 10th of July 2020 at 3 p.m. (in local time as there is no time zone offset specified—more on that below).
ISO 8601. This format is defined by the sensible practical standard, ISO 8601. The T separates the date portion from the time-of-day portion. The Z on the end means UTC (that is, an offset-from-UTC of zero hours-minutes-seconds).
The standard itself doesn't clarify, but the only obvious interpretation here is that the interval repeats back-to-back. So this recurring interval:
R2/2008-03-01T13:00:00Z/P1Y2M10DT2H30M
Will be equivalent to these non-recurring intervals:
2008-03-01T13:00:00Z/P1Y2M10DT2H30M
2009-05-01T15:30:00Z/P1Y2M10DT2H30M
(Note: my reading is that the number of repetitions does include the first occurrence)
There is no way to represent "every Monday from 13:00 to 14:00" inside of ISO 8601, but it's natural to do for a VEVENT in the iCalendar format. (If you could do that entirely within ISO 8601, then that would give rise to a slew of further feature requests)
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