surveillance: isoWeekYear – R documentation

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isoWeekYear

Find ISO Week and Year of Date Objects

Description

The function isoWeekYear extracts the year and week of a Date according to the ISO 8601 specification. It simply calls strftime with format strings "%G" and "%V", respectively.

Usage

isoWeekYear(Y, M, D)

Arguments

`Y`	year(s) or a Date/POSIXt object. Can be a vector.
`M`	month(s), only used if `Y` is not a Date/POSIXt object.
`D`	day(s), only used if `Y` is not a Date/POSIXt object.

Value

A list with entries ISOYear and ISOWeek containing the corresponding results.

Examples

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))

surveillance

Temporal and Spatio-Temporal Modeling and Monitoring of Epidemic Phenomena

v1.19.1

GPL-2

Authors

Michael H<f6>hle [aut, ths] (<https://orcid.org/0000-0002-0423-6702>), Sebastian Meyer [aut, cre] (<https://orcid.org/0000-0002-1791-9449>), Michaela Paul [aut], Leonhard Held [ctb, ths], Howard Burkom [ctb], Thais Correa [ctb], Mathias Hofmann [ctb], Christian Lang [ctb], Juliane Manitz [ctb], Andrea Riebler [ctb], Daniel Saban<e9>s Bov<e9> [ctb], Ma<eb>lle Salmon [ctb], Dirk Schumacher [ctb], Stefan Steiner [ctb], Mikko Virtanen [ctb], Wei Wei [ctb], Valentin Wimmer [ctb], R Core Team [ctb] (A few code segments are modified versions of code from base R)

Initial release

2021-03-30