date: Date Extraction and Conversion

In TobieSurette/gulf.utils: Southern Gulf of Saint Lawrence Utility Functions

Date Extraction and Conversion

Description

These are wrapper functions to extract a date field from an object, such as a character string or a data frame.

Usage

date(x, ...)

## Default S3 method:
date(x, year, month, day, ...)

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

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

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

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

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

Arguments

x	Object.
...	Further arguments.
year	Date year.
month	Date month.
day	Date day.

Value

Generally a POSIXct or POSIXt object.

Methods (by class)

• date(default): Default date method.

• date(character): Convert character string to date.

• date(data.frame): Extract date from a data frame.

Functions

• day(default): Default method for extracting day from a date.

• month(default): Default method for extracting month from a date.

• year(default): Default method for extracting year field from a date.

See Also

time

Examples

date() # Base method.

# Single day:
date(year = 2000, month = 9, day = 19)

# Entire month:
date(year = 2000, month = 9, day = 1:30)

# Sorts out YYYYMMDD and DDMMYYYY:
date(c("2000-01-19", "19-01-2000", "2000/01/19", "00-1-19"))

# Apply to data frame:
x <- data.frame(Year = 2000, Month = 01, Day = 1:30)
date(x)

TobieSurette/gulf.utils documentation built on Dec. 1, 2024, 6:01 a.m.