[6416] in s-news-athena
DATE ARITHMETIC FUNCTIONS
daemon@ATHENA.MIT.EDU (Emily Dickinson)
Wed Feb 8 19:13:56 1995
Date: Wed, 8 Feb 95 16:46:10 MST
From: emily@predict.com (Emily Dickinson)
To: s-news@utstat.toronto.edu
##############################################################################
Thanks to all for the useful responses to this question:
> Has anyone out there put together a package of date arithmetic
> functions. E.g., functions to add/subtract a day to a given date, get
> tomorrow's date from today's date, determine whehter or not a given
> date is a weekend, etc.?
For simple date arithmetic see the "blue" book (Becker, Chambers, and Wilks)
section 9.2.1 (p.268-271)---the code is in library(examples);
S-plus (version 3.2?) has the unsupported library(chron) from Bell Labs;
also, see Terry Thurneau's "date2" package in statlib.
David A James
AT&T Bell Labs
##############################################################################
Section 9.2.1 of the blue book (pp. 268-271) has some of the answers
you're looking for. There's also a contribution called "date" in the S
archive of statlib which may also be useful.
alejandro munoz-del-rio AB13 Russell Labs (Forestry) work: (608) 263-0853
##############################################################################
The "date" package on statlib handles this. Another is the "chron"
package by David James, which is part of Splus version 3.2 .
Terry M. Therneau, Ph.D. (507) 284-1817
Department of Health Science Research (507) 284-5231 FAX
Mayo Clinic therneau.terry@mayo.edu
Rochester, Minn 55905
##############################################################################
Version 3.2 of Splus comes with a whole library package which allows
arithmetic and much more on dates and times. It is not supported by
StatSci so I don't know if your local installation has it. If it has
it should be installed as a library, so as a starting point you
can just type
library(help="chron") for a README file
and
library(chron) to load the package. There is also a doc file on the
ATT anonymsou ftp server, it is mentioned at the end of the README
file.
-- Reiner --
##############################################################################
