Returns the year and the week of the year of a given date according to ISO 8601.
It is an alternative to
Vector which can be coerced to class
The conversion specifications
where not available on Windows and MacOS before
According to ISO 8601, the year of the week can differ from the calendar year (see the examples).
A character vector of year and week in format "
strftime for a description of conversion specifications and references
on ISO 8601.
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