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# This R package is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This R package 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 Library General Public License for more details.
#
# You should have received a copy of the GNU Library General
# Public License along with this R package; if not, write to the
# Free Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
################################################################################
# METHOD: DESCRIPTION:
# julian,timeDate Returns Julian day counts since 1970-01-01
################################################################################
## GNB: no need to make julian() S4 generic, just create an S3 method
## setMethod("julian", "timeDate",
julian.timeDate <-
function(x, origin = timeDate("1970-01-01"),
units = c("auto", "secs", "mins", "hours", "days", "weeks"),
zone = NULL, FinCenter = NULL, ...)
{
# A function implemented by Diethelm Wuertz
# Description:
# Extracts Julian time in days since 1970-01-01
# Arguments:
# x - a 'timeDate' object
# units - a character string, one of the units listed,
# by default "secs".
# Value:
# Returns the number of days (possibly fractional) since
# the origin.
# Details:
# The origin is "1970-01-01 00:00:00 GMT"
# Set Timezone to GMT:
# Check Class Type:
stopifnot(is(x, "timeDate"))
units = match.arg(units)
# POSIX:
if (is.null(zone)) zone = x@FinCenter
if (is.null(FinCenter)) FinCenter = x@FinCenter
ct = timeDate(x, zone = zone, FinCenter = FinCenter)
# Difftime:
if (is.null(origin))
origin = timeDate("1970-01-01", zone = "GMT", FinCenter = "GMT")
res = difftimeDate(ct, origin, units = units)
# Return Value:
structure(res, origin = origin)
}
################################################################################
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