component_extract {messydates} | R Documentation |
Extracting components from messy dates
Description
These functions allow the extraction of particular date components
from messy dates, such as the year()
, month()
, and day()
.
precision()
allows for the identification of the greatest level of
precision in (currently) the first element of each date.
Usage
year(x)
month(x)
day(x)
precision(x)
## S3 method for class 'mdate'
precision(x)
Arguments
x |
A |
Value
year()
, month()
, and day()
extraction return the integer
for the requested date component.
precision()
returns the level of greatest precision for each date.
Precision
Date precision is measured relative to the day in 1/days(x)
.
That is, a date measured to the day will return a precision score
of 1, a date measured to the month will return a precision score of
between 1/28
and 1/31
, and annual measures will have
a precision of between 1/365
and 1/366
.
Examples
year(as_messydate(c("2012-02-03","2012","2012-02")))
month(as_messydate(c("2012-02-03","2012","2012-02")))
day(as_messydate(c("2012-02-03","2012","2012-02")))
precision(as_messydate(c("2012-02-03","2012","2012-02")))
[Package messydates version 0.5.4 Index]