Get/set weeks component of a date-time.

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Description

week returns the number of complete seven day periods that have occured between the date and January 1st, plus one.
isoweek returns the week as it would appear in the ISO 8601 system, which uses a reoccuring leap week.

Usage

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week(x)

week(x) <- value

isoweek(x)

Arguments

x

a date-time object. Must be a POSIXct, POSIXlt, Date, chron, yearmon, yearqtr, zoo, zooreg, timeDate, xts, its, ti, jul, timeSeries, or fts object.

value

a numeric object

Value

the weeks element of x as an integer number

References

http://en.wikipedia.org/wiki/ISO_week_date

See Also

isoyear

Examples

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x <- ymd("2012-03-26")
week(x)
week(x) <- 1
week(x) <- 54
week(x) > 3

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