R: Get/set weeks component of a date-time.

week {lubridate} | R Documentation

## Get/set weeks component of a date-time.

### 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

    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

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

[Package lubridate version 1.6.0 Index]