Colleagues,
I just encountered some unexpected behavior of difftime in
relationship to the change from daylight savings to standard time. My
understanding is that DST and ST take effect at 2AM. However, the
code below suggests that R (version 2.8.0 in OS X) implements the
change at 2:16AM:
Expected:
> > difftime("2008-11-02 02:01:00", "2008-11-02 00:59:00")
> Time difference of 2.033333 hours
> > difftime("2008-11-02 01:16:00", "2008-11-02 01:15:00")
> Time difference of 1 mins
> > difftime("2008-11-02 01:18:00", "2008-11-02 01:17:00")
> Time difference of 1 mins
Not expected:
> > difftime("2008-11-02 01:17:00", "2008-11-02 01:16:00")
> Time difference of 1.016667 hours
Can anyone explain this?
Dennis
Dennis Fisher MD
P < (The "P Less Than" Company)
Phone: 1-866-PLessThan (1-866-753-7784)
Fax: 1-415-564-2220
www.PLessThan.com
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