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# This library 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 library 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 library; if not, write to the
# Free Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
# Copyrights (C)
# for this R-port:
# 1999 - 2008, Diethelm Wuertz, Rmetrics Foundation, GPL
# Diethelm Wuertz <wuertz@itp.phys.ethz.ch>
# info@rmetrics.org
# www.rmetrics.org
# for the code accessed (or partly included) from other R-ports:
# see R's copyright and license files
# for the code accessed (or partly included) from contributed R-ports
# and other sources
# see Rmetrics's copyright file
################################################################################
# FUNCTION: DESCRIPTION:
# timeDate Creates a 'timeDate' object from given dates
# .formatFinCenter Internal called by timeDate
################################################################################
timeDate <-
function(charvec = Sys.timeDate(), format = NULL, zone = myFinCenter,
FinCenter = myFinCenter)
{
# A function implemented by Diethelm Wuertz
# Description:
# Creates a "timeDate' object from a character vector
# Arguments:
# charvec - a character vector of dates and times. Alternatively
# it may be a 'timeDate', a 'Date', or a 'POSIXt' object. In
# these cases the argument will be coerced into a character
# string or character vector.
# format - the format specification of the input character
# vector. If set to NULL autodetection will be tried.
# zone - the time zone or financial center where the data
# were recorded.
# FinCenter - a character string with the the location of
# the financial center named as "continent/city" where the
# data will be used.
# Value:
# Returns a S4 object of class 'timeDate'.
# Note:
# Changeover DST not yet fully implemented!
# Examples:
# timeDate("2004-01-01")
# timeDate("2004-01-01 00:00:00")
# timeDate("20040101")
# timeDate("200401011600")
# timeDate("20040101000000")
# timeDate("1/1/2004") # American format
# timeDate("2004-01-01", FinCenter = "GMT")
# timeDate("20040101", FinCenter = "GMT")
# td = timeDate("2004-01-01", FinCenter = "GMT"); timeDate(td)
# td = timeDate("20040101", FinCenter = "GMT"); timeDate(td)
# FUNCTION:
# Settings and Checks:
trace = FALSE
if (FinCenter == "" || is.null(FinCenter)) FinCenter = "GMT"
if (is.null(zone)) zone = "GMT"
# Check Time Zone:
TZ <- Sys.getenv("TZ")
if(TZ[[1]] != "GMT") {
Sys.setenv(TZ = "GMT")
on.exit(Sys.setenv(TZ = TZ))
}
# ISO Date/Time Format:
isoDate <- "%Y-%m-%d"
isoFormat <- "%Y-%m-%d %H:%M:%S"
if (inherits(charvec, "character")) { # Autodetect Format:
if (is.null(format))
format <- whichFormat(charvec)
} else { ## convert from known classes to ISO :
format <- isoFormat
charvec <-
if (is(charvec, "timeDate")) {
format(charvec@Data, format)
} else if (inherits(charvec, "Date")) {
zone <- FinCenter
format <- isoDate
format(charvec, format)
} else if (inherits(charvec, "POSIXt")) {
format(charvec, format)
}
}
# Midnight Standard & conversion to isoFormat:
charvec <- midnightStandard(charvec, format)
# Financial Centers:
recFinCenter = zone # Time zone where the data were recorded
useFinCenter = FinCenter # Time zone where the data will be used
# Trace Input:
if (trace) {
cat("\nInput: ")
print(recFinCenter)
print(charvec)
}
## Convert:
if (recFinCenter == "GMT" && useFinCenter == "GMT") {
## GMT -> GMT:
## nothing to do
} else if (recFinCenter == "GMT" && useFinCenter != "GMT") {
## GMT -> nonGMT
charvec = .formatFinCenter(charvec, useFinCenter, type = "gmt2any")
} else if (recFinCenter != "GMT" && useFinCenter == "GMT") {
## nonGMT -> GMT
charvec = .formatFinCenter(charvec, recFinCenter, type = "any2gmt")
} else if (recFinCenter == useFinCenter) {
## nonGMT -> equal nonGMT
## nothing to do
} else if (recFinCenter != useFinCenter) {
## nonGMT -> other nonGMT
charvec = .formatFinCenter(charvec, recFinCenter, type = "any2gmt")
charvec = .formatFinCenter(charvec, useFinCenter, type = "gmt2any")
} else {
## impossible
## when *not* returning a timeDate() object, we should warn
message("returning NULL instead of \"timeDate\"")
return(invisible())
}
## In all good cases :
if (trace) {
cat("\nOutput: ")
print(useFinCenter)
print(charvec)
cat("\n")
}
lt <- strptime(charvec, isoFormat)
noTime <- lt$sec == 0 & lt$min == 0 & lt$hour == 0
noTime <- all(noTime | is.na(noTime))
new("timeDate",
Data = as.POSIXct(lt),
format = if(noTime) isoDate else isoFormat,
FinCenter = useFinCenter)
}
# ------------------------------------------------------------------------------ ------------------------------------------------------------------------------
.formatFinCenter <-
function(charvec, FinCenter, type = c("gmt2any", "any2gmt"))
{
# A function implemented by Diethelm Wuertz
# Description:
# Internal function used by function timeDate()
if (FinCenter == "GMT")
return(charvec)
## else start working:
type <- match.arg(type)
signum <- switch(type,
"gmt2any" = +1,
"any2gmt" = -1)
## otherwise give error
# Get the DST list from the database:
dst.list = rulesFinCenter(FinCenter)
# Update list with last entry:
z = as.matrix(dst.list)
z[dim(z)[1], ]
vec1 = as.vector(c(z[, 1], "2099-01-01 00:00:00"))
vec2 = as.vector(c(z[, 2], rev(z[, 2])[1]))
dst.list = data.frame(ruleChanges = as.character(vec1),
offSet = as.integer(vec2))
# Extract the dates when DST was changed:
dst.dates = as.character(dst.list[, 1])
# Extract the Offsets to GMT
dst.offsets = as.character(dst.list[, 2])
# The new dates ar the charvec's:
new.dates = charvec
# The new offsets are still unknown:
new.offsets = rep(NA, length(charvec))
# Combine all Dates and Offsets:
dates = c(dst.dates, new.dates)
offsets = c(dst.offsets, new.offsets)
# The number of Offsets:
n = length(dates)
# Order the Dates:
o = order(dates)
# Dates and Offsets in the right order:
o.dates = dates[o]
o.offsets = offsets[o]
# The points at which we have to determine the offsets
xout = (1:n)[is.na(o.offsets)]
# The date indexes:
x = (1:n)[-xout]
# The corresponding offsets
y = o.offsets[x]
# The new offsets:
yout = approx(x, y , xout, method = "constant")$y
# All dates:
m = length(dst.dates)
# Put them in the right order:
# Added DW: 2005-05-27
idx = order(o[which(o>m)])
offSets = yout[idx]
dt = strptime(charvec, "%Y-%m-%d %H:%M:%S")
## Return Value:
format(dt + signum * offSets, format="%Y-%m-%d %H:%M:%S")
}
################################################################################
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