wp_date: Package specific 'as.Date()' function

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Description

wp_date() provides a generic function and several methods to transform something into a date, just like as.Date(). While most methods were copied 1:1 from as.Date() some changes were made that alter the usual behavior: (1) Whenever wp_date() is applied to an empty string "" or any other not-standard-unambiguous format the function will return NA and throw out a warning instead of simply kill itself with an error. (2) Whenever, as.Date usually is in the need of an origin supplied and does not get one wp_date() will assume the origin to be "1970-01-01" and throw an error instead of kill itself with an error. All these changes are made with the special purpose to make wp_trend() also with dirty, unreasonable data (e.g. "" or "2012-13-01" or "2012-02-32") and are not recommended for any other than wikipediatrend internal use.

Usage

wp_date(x, ...)

## S3 method for class 'character'
wp_date(x, format = "", ...)

## Default S3 method:
wp_date(x, ...)

## S3 method for class 'numeric'
wp_date(x, origin, ...)

## S3 method for class 'date'
wp_date(x, ...)

## S3 method for class 'dates'
wp_date(x, ...)

## S3 method for class 'factor'
wp_date(x, ...)

## S3 method for class 'POSIXct'
wp_date(x, tz = "UTC", ...)

## S3 method for class 'POSIXlt'
wp_date(x, ...)

Arguments

x	See ?as.Date
...	See ?as.Date
format	See ?as.Date
origin	See ?as.Date
tz	See ?as.Date

Methods (by class)

• character: Difference to as.Date.character(): Failing to parse the date, wp_date() will give return a warning and NA instead of killing itself with an error.

• default: same as as.Date()

• numeric: Difference to as.Date.character(): Whenever an origin is needed but not supplied isntead of breaking, wp_date() will raise a warning and proceed by assuming "1970-01-01" to be the origin instead of killing itself with an error.

• date: same as as.Date()

• dates: same as as.Date()

• factor: same as as.Date()

• POSIXct: same as as.Date()

• POSIXlt: using as.Date()

johndharrison/wikipediatrend documentation built on May 19, 2019, 5:14 p.m.