[Rd] R1.8.0 : seq.POSIXt() problems
Marsland, John
John.Marsland at CommerzbankIB.com
Fri Oct 10 13:51:48 MEST 2003
I'm having problems with seq.POSIXt() under R 1.8.0 (Windows NT4).
Essentially the last date in my sequence is lost depending on whether the
sequence spans a daylight saving time change.
This seems to apply regardless as to whether one uses by="DSTdays" or
by="days".
Try the following lines of code:
> seq.POSIXt(as.POSIXct("2003-09-01"),as.POSIXct("2003-10-09"),"DSTdays")
[1] "2003-09-01 GMT Daylight Time" "2003-09-02 GMT Daylight Time"
...
[39] "2003-10-09 GMT Daylight Time"
> seq.POSIXt(as.POSIXct("2003-03-01"),as.POSIXct("2003-10-09"),"DSTdays")
[1] "2003-03-01 GMT Standard Time" "2003-03-02 GMT Standard Time"
...
[221] "2003-10-07 GMT Daylight Time" "2003-10-08 GMT Daylight Time"
> seq.POSIXt(as.POSIXct("2002-10-01"),as.POSIXct("2003-10-09"),"DSTdays")
[1] "2002-10-01 GMT Daylight Time" "2002-10-02 GMT Daylight Time"
...
[373] "2003-10-08 GMT Daylight Time" "2003-10-09 GMT Daylight Time"
Any thoughts?
Regards,
John
> R.version
_
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status
major 1
minor 8.0
year 2003
month 10
day 08
language R
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