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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 - Diethelm Wuertz, GPL
# 2007 - Rmetrics Foundation, GPL
# Diethelm Wuertz <wuertz@phys.ethz.ch>
# 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:
# timeLastDayInMonth Computes the last day in a given month and year
# timeFirstDayInMonth Computes the first day in a given month and year
# timeLastDayInQuarter Computes the last day in a given quarter and year
# timeFirstDayInQuarter Computes the first day in a given quarter and year
################################################################################
timeLastDayInMonth <-
function(charvec, format = "%Y-%m-%d", zone = myFinCenter,
FinCenter = myFinCenter)
{
# A function implemented by Diethelm Wuertz
# Description:
# Computes the last day in a given month and year
# Arguments:
# charvec - a character vector of dates and times.
# format - the format specification of the input character vector.
# FinCenter - a character string with the the location of the
# financial center named as "continent/city".
# Value:
# Returns the last day in a given month and year as a
# 'timeDate' object.
# FUNCTION:
# Set Timezone to GMT:
myTZ = Sys.getenv("TZ")
Sys.setenv(TZ = "GMT")
if (FinCenter == "") FinCenter = "GMT"
# Last day of month:
last.day = c(31,28,31, 30,31,30, 31,31,30, 31,30,31)
lt = strptime(charvec, format)
y = 1900 + lt$year
leap.year = (y%%4 == 0 & (y%%100 != 0 | y%%400 == 0))
leap.day = as.integer(leap.year)*as.integer(lt$mon == 1)
lt$mday = last.day[1 + lt$mon] + leap.day
# Return Value:
Sys.setenv(TZ = myTZ)
timeDate(lt, format = "%Y-%m-%d", zone = zone, FinCenter = FinCenter)
}
# ------------------------------------------------------------------------------
timeFirstDayInMonth <-
function(charvec, format = "%Y-%m-%d", zone = myFinCenter,
FinCenter = myFinCenter)
{
# A function implemented by Diethelm Wuertz
# Description:
# Computes the last day in a given month and year
# Changes:
#
# FUNCTION:
# Set Timezone to GMT:
myTZ = Sys.getenv("TZ")
Sys.setenv(TZ = "GMT")
if (FinCenter == "") FinCenter = "GMT"
# First Day In Month:
lt = strptime(charvec, format)
lt$mday = 1
# Return Value:
Sys.setenv(TZ = myTZ)
timeDate(lt, format = "%Y-%m-%d", zone = zone, FinCenter = FinCenter)
}
# ------------------------------------------------------------------------------
timeLastDayInQuarter <-
function(charvec, format = "%Y-%m-%d", zone = myFinCenter,
FinCenter = myFinCenter)
{
# A function implemented by Diethelm Wuertz
# Description:
# Computes the last day in a given month and year
# FUNCTION:
# First Day in Month:
charvec = timeFirstDayInMonth(charvec = charvec, format = format,
FinCenter = FinCenter)
# Set Timezone to GMT:
myTZ = Sys.getenv("TZ")
Sys.setenv(TZ = "GMT")
if (FinCenter == "") FinCenter = "GMT"
# Last Day in Quarter:
lt = strptime(charvec, format)
last.quarter = rep(c(3,6,9,12), each = 3) - 1
lt$mon = last.quarter[1 + lt$mon]
Sys.setenv(TZ = myTZ)
charvec = timeDate(lt, format = "%Y-%m-%d", zone = zone,
FinCenter = FinCenter)
# Return Value:
Sys.setenv(TZ = myTZ)
timeLastDayInMonth(charvec = charvec, format = format,
zone = zone, FinCenter = FinCenter)
}
# ------------------------------------------------------------------------------
timeFirstDayInQuarter <-
function(charvec, format = "%Y-%m-%d", zone = myFinCenter,
FinCenter = myFinCenter)
{
# A function implemented by Diethelm Wuertz
# Description:
# Computes the last day in a given month and year
# Changes:
#
# FUNCTION:
# First Day in Month:
charvec = timeFirstDayInMonth(charvec =charvec, format = format,
FinCenter = FinCenter)
# Set Timezone to GMT:
myTZ = Sys.getenv("TZ")
Sys.setenv(TZ = "GMT")
if (FinCenter == "") FinCenter = "GMT"
# First Day in Quarter:
lt = strptime(charvec, format)
first.quarter = rep(c(1,4,7,10), each = 3) - 1
lt$mon = first.quarter[1 + lt$mon]
# Return Value:
Sys.setenv(TZ = myTZ)
timeDate(lt, format = "%Y-%m-%d", zone = zone, FinCenter = FinCenter)
}
################################################################################
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