Get/set weeks component of a date-time.
Date-time must be a POSIXct, POSIXlt, Date, chron, yearmon, yearqtr, zoo, zooreg, timeDate, xts, its, ti, jul, timeSeries, and fts objects. Weeks is the number of complete seven day periods that have occured between the date and January 1st, plus one.
- a date-time object
- the weeks element of x as an integer number
x <- ymd("2012-03-26") week(x) week(x) <- 1 week(x) <- 54 week(x) > 3