#
# xts: eXtensible time-series
#
# Copyright (C) 2008 Jeffrey A. Ryan jeff.a.ryan @ gmail.com
#
# Contributions from Joshua M. Ulrich
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# fixes for R new/broken as.Date, as.POSIXlt and as.POSIXct
# hopefully to be removed when remedied in R
# taken directly from 'base', with origin set to '1970-01-01' (1970-01-01)
`as.Date.numeric` <- function(x, origin='1970-01-01', ...) {
as.Date(origin,...) + x
}
`as.POSIXct.numeric` <- function(x, tz="", origin='1970-01-01', ...) {
structure(x, class=c("POSIXt", "POSIXct"))
}
`as.POSIXlt.numeric` <- function(x, tz="", origin='1970-01-01', ...) {
as.POSIXlt(as.POSIXct(origin,tz="UTC",...) + x, tz=tz)
}
as.POSIXct.Date <- function(x, ...)
{
as.POSIXct(as.character(x))
}
as.Date.POSIXct <- function(x, ...)
{
as.Date(strftime(x))
# z <- floor(unclass((x - unclass(as.POSIXct('1970-01-01'))))/86400)
# attr(z, 'tzone') <- NULL
# structure(z, class="Date")
}
as.POSIXlt.Date <- function(x, ...)
{
as.POSIXlt(as.POSIXct.Date(x))
}
#as.POSIXct.yearmon <- function(x, ...)
#{
# structure(as.POSIXct("1970-01-01") + unclass(as.Date(x))*86400,
# class=c("POSIXt","POSIXct"))
#}
#
#as.POSIXlt.yearmon <- function(x, ...)
#{
# as.POSIXlt(xts:::as.POSIXct.yearmon(x))
#}
#
as.POSIXct.dates <- function(x, ...)
{
# need to implement our own method to correctly handle TZ
#as.POSIXct(as.character(as.POSIXlt(x,tz="GMT")))
structure(as.POSIXct(as.POSIXlt(x, tz="GMT"), tz="GMT"),class=c("POSIXt","POSIXct"))
}
as.chron.POSIXct <- function(x, ...)
{
if( !require('chron', quietly=TRUE))
as.chron <- function(...) message("package 'chron' required")
structure(as.chron(as.POSIXlt(as.character(x))))
}
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