Hello,
The reason why is that you've misspelled CET (not CEST)
> dt1 = as.POSIXct("2014-04-18 09.00", format="%Y-%m-%d %H.%M", tz =
"CEST")
Warning messages:
1: In strptime(x, format, tz = tz) : unknown timezone 'CEST'
2: In as.POSIXct.POSIXlt(as.POSIXlt(x, tz, ...), tz, ...) :
unknown timezone 'CEST'
> dt2 = as.POSIXct("2014-04-18 09.00", format="%Y-%m-%d %H.%M", tz = "GMT")
> dt1 = as.POSIXct("2014-04-18 09.00", format="%Y-%m-%d %H.%M", tz = "CET")
> dt1-dt2
Time difference of -2 hours
Hope this helps,
Rui Barradas
Em 18-04-2014 17:13, Nicola Sturaro Sommacal escreveu:
Hi.
I am new to POSIX and I'd like to understand the reason of this difference.
dt1 = as.POSIXct("2014-03-29 09.00", format="%Y-%m-%d %H.%M")
dt2 = as.POSIXct("2014-03-30 09.00", format="%Y-%m-%d %H.%M")
dt2-dt1
dt1[1] "2014-03-29 09:00:00 CET"> dt2[1] "2014-03-30 09:00:00 CEST"> dt2-dt1
Time difference of 23 hours
This is right, because on Mar 31 at 2 PM we jump directly to 3PM, DST.
On the contrary, I don't understand the following:
dt1 = as.POSIXct("2014-04-18 09.00", format="%Y-%m-%d %H.%M", tz = "CEST")
dt2 = as.POSIXct("2014-04-18 09.00", format="%Y-%m-%d %H.%M", tz = "GMT")
dt1[1] "2014-04-18 09:00:00 CEST"> dt2[1] "2014-04-18 09:00:00 GMT">
dt1-dt2Time difference of 0 secs
I should expected a time difference of 2 hours, as CEST is GMT+2.
Anyone can help me?
Thank you,
Nicola
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