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G.2.1.5 Week number %k[date] special text

Is replaced by either the 2-digit ISO week number or the standard week number with leading zero, or a 4-alphanumeric character text of the current week of year
(see Calendar option --starting-day=argument, Calendar option --iso-week-number=yes|no, and Aspects in Internationalization, for further details), e.g.:
The text ‘Today is %K  of week %k will be expanded to
==> ‘Today is Monday of week 24, in case the actual system date is the 10th June 1996.