From Wikipedia:

Either basic or extended formats may be used, but both date and time must use the same format.
(Basic format meaning without separators). There's no citation to go with it though.

In reply to Re: Does ISO8601 require a separator in the time if one is used in the date? by Eily
in thread Does ISO8601 require a separator in the time if one is used in the date? by 1nickt

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