[LEAPSECS] Leap second relationship to ISO 8601

[Gerard Ashton]

Tony Finch wrote

> Right, and this is good for many purposes, e.g. recording times of events
now or in the past. However for events in the future (meetings etc.) you
need to record a time and a place, because the UTC offset and time zone
rules are not predictable.

Even better, local time can be used to specify recurring meetings which
begin at the same local time, but different UTC times, because of daylight
saving time. ISO 8601 has a notation for recurring events, although I have
not mastered it.

Gerry Ashton