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#' @include periods.r
NULL
#' Get/set hours component of a date-time.
#'
#' Date-time must be a POSIXct, POSIXlt, Date, Period, chron, yearmon, yearqtr, zoo,
#' zooreg, timeDate, xts, its, ti, jul, timeSeries, and fts objects.
#'
#' @export
#' @aliases hour hour<-
#' @param x a date-time object
#' @keywords utilities manip chron methods
#' @return the hours element of x as a decimal number
#' @examples
#' x <- ymd("2012-03-26")
#' hour(x)
#' hour(x) <- 1
#' hour(x) <- 25
#' hour(x) > 2
hour <- function(x)
UseMethod("hour")
#' @export
hour.default <- function(x)
as.POSIXlt(x, tz = tz(x))$hour
#' @export
hour.Period <- function(x)
slot(x, "hour")
#' @export
"hour<-" <- function(x, value)
x <- x + hours(value - hour(x))
setGeneric("hour<-")
#' @export
setMethod("hour<-", signature("Period"), function(x, value){
slot(x, "hour") <- value
x
})
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