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

From: Leeds, Mark (IED) <Mark.Leeds_at_morganstanley.com>
Date: Thu 04 Jan 2007 - 17:53:16 GMT


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@stat.math.ethz.ch
[mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of Ben Fairbank Sent: Thursday, January 04, 2007 12:43 PM To: r-help@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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