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The function isoWeekYear extracts the year and week of a Date according to the ISO 8601 specification.
isoWeekYear
Date
isoWeekYear(Y, M, D)
A list with entries ISOYear and ISOWeek containing the corresponding results.
ISOYear
ISOWeek
year(s) or a Date/POSIXt object. Can be a vector.
month(s), only used if Y is not a Date/POSIXt object.
Y
day(s), only used if Y is not a Date/POSIXt object.
dates <- as.Date(c("2002-12-31","2003-01-01","2003-01-06")) isoWeekYear(dates) ## the same using numeric inputs: isoWeekYear(Y = c(2002, 2003, 2003), M = c(12, 1, 1), D = c(31, 1, 6))
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