as_yrwk: Convert an object to a yrwk

In tjtnew/grates: Grouped Date Classes

Description

• Date, POSIXct, and POSIXlt are converted directly. Any day, hour, minute, or second components are dropped. POSIXct and POSIXlt are converted to dates via as.date() with the timezone respected.

• Character input is assumed to be provided in either ISO 8601 standard format, i.e. "yyyy-mm-dd", or yrwk format, i.e. "yyyy-Www". On conversion the day component will be dropped.

Usage

as_yrwk(x, firstday = 1L, ...)

## Default S3 method:
as_yrwk(x, firstday = 1L, ...)

## S3 method for class 'yrwk'
as_yrwk(x, ...)

## S3 method for class 'Date'
as_yrwk(x, firstday = 1L, ...)

## S3 method for class 'POSIXt'
as_yrwk(x, firstday = 1L, ...)

## S3 method for class 'character'
as_yrwk(x, firstday = 1L, ...)

## S3 method for class 'factor'
as_yrwk(x, firstday = 1L, ...)

Arguments

x	'An object to coerce to yrwk.
firstday	An integer representing the day the week starts on from 1 (Monday) to 7 (Sunday).
...	Not used.

References

The algorithm to convert between dates and yrwk, builds upon the work of Xiahong Zhao in the EpiWeek package and Zhian Kamvar in the aweek package.

Examples

as_yrwk(Sys.Date())
as_yrwk(as.POSIXct("2019-03-04 01:01:01", tz = "America/New_York"))
as_yrwk("2019-05-03")
as_yrwk("2021-W03")

tjtnew/grates documentation built on Feb. 6, 2021, 6:12 p.m.