Mark, not sure that's the answer.

Usually one has x=y --> f(x)=f(y)

which doesn't seem to hold here (put x=zzz1, y=zzz2, f=as.Date()).

Or do I overlook something?


----- Original Message ----- From: "Marek Janad" <marek.ja...@gmail.com>
To: <r-help@r-project.org>
Sent: Thursday, December 24, 2009 00:08
Subject: Re: [R] as.Date question


Look at documentation

?as.Date

as.Date first represents time in UTC, what gives:

as.POSIXlt(zzz1, tz="UTC")

HTH

2009/12/20 MAL <diver...@univecom.ch>:
All!

This piece of code:

zzz1 <- as.POSIXct("1999-03-18", tz="CET")
zzz2 <- as.POSIXlt("1999-03-18", tz="CET")
zzz1 == zzz2
as.Date(zzz1)
as.Date(zzz2)

yields TRUE for "zzz1==zzz2", but the two dates returned by as.Date are
different:

as.Date(zzz1)

[1] "1999-03-17"

as.Date(zzz2)

[1] "1999-03-18"

I'm using R 2.10.0.

Would be glad for any clarifications. Thanks!

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--
Marek

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