[R] Seek general information about time/date storage and functionsin R

Leeds, Mark (IED) Mark.Leeds at morganstanley.com
Thu Jan 4 18:53:16 CET 2007

I think the best explanation of dates and times is in r-news 2.4.1 but
2.4.1 might be off so someone will hopefully correct me if I'm wrong.

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Ben Fairbank
Sent: Thursday, January 04, 2007 12:43 PM
To: r-help at stat.math.ethz.ch
Subject: [R] Seek general information about time/date storage and
functionsin R

Hello R List -


I have to import Excel files (either as .csv files or using RODBC) into
R (2.4.1, Windows) and operate on dates and times (e.g. find minutes
between times, change dates to days of week or analyze by weeks of
year).  The help files for format.Date, strptime, as.POSIX,
DateTimeClasses, etc. etc. are informative but perhaps a little terse.
I have googled unsuccessfully for a more general description of how R
represents times and dates, and the methods (e.g. date arithmetic) for
working with them.  Can a reader point out such an introduction,
preferably on-line?


Thank you,


Ben Fairbank



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