Return Various Periods from a Chron or Dates Object
Given a chron or dates object, extract the year, quarter, month, day (within the month) or weekday (days within the week) of the date it represents.
days(x) "weekdays"(x, abbreviate = TRUE) "months"(x, abbreviate = TRUE) "quarters"(x, abbreviate = TRUE) years(x)
generics defined in package base which also provides methods for
objects of class
"Date" as generated, e.g., by
Sys.Date. These methods return character rather
than factor variables as the default methods in chron do.
To take advantage of the latter, Date objects can be converted to
dates objects using
as.chron, see the examples.
an ordered factor corresponding to days, weekdays, months, quarters,
or years of
xfor the respective function.
dts <- dates("07/01/78") + trunc(50 * rnorm(30)) plot(weekdays(dts)) plot(months(dts)) ## The day in the current timezone as a Date object. Dt <- Sys.Date() ## Using the months method for Date objects. months(Dt) ## Using the months default method. months(as.chron(Dt))