component_extract | R Documentation |
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.
year(x)
month(x)
day(x)
precision(x)
## S3 method for class 'mdate'
precision(x)
x |
A |
year()
, month()
, and day()
extraction return the integer
for the requested date component.
precision()
returns the level of greatest precision for each date.
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
.
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")))
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