datetime - How to describe repeating intervals which has an unfixed time interval in ISO 8601? -

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for example, time format has fixed time interval, can describe "30 9 * * *"(crontab time format) "r/2015-03-01t09:30:00-06:00/p1d" in iso 8601.

but how can describe "10 2,4,6,8,10,14,18,22 * * *" (which has unfixed time interval) in iso 8601?

thanks lot!


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