[R] Doing things with POSIXt

Dirk Eddelbuettel edd at debian.org
Tue Nov 27 04:22:11 CET 2001

  "Vadim" == Vadim Ogranovich <vograno at arbitrade.com> writes:
  Vadim>  The catch is that the daytime of "1992-01-14 01:03:30 PST" is
  Vadim> 1.058333 and not 7.058333 as your system produces. On my system it
  Vadim> is 9.058333 hours, which makes me think it has something to do with
  Vadim> time zones.

> datetime <- as.POSIXct("1992-01-14 01:03:30 PST", tz="PST")
> as.numeric(difftime(datetime, midnight, "hours"))
[1] 1.058333


Better to have an approximate answer to the right question 
than a precise answer to the wrong question. -- John Tukey
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