> On Dec 9, 2015, at 10:58 AM, Micha Silver <mi...@arava.co.il> wrote:
>
> Hello all:
> I am creating a time series using seq.POSIXt.
>
> ts.full <- as.character(seq.POSIXt(as.POSIXct(start(d.zoo)),
> as.POSIXct(end(d.zoo)), by="hour"))
>
> The period crosses the hour of change from "summer time" to "winter time".
> When checking with:
> duplicated(ts.full)
> I see that there are some duplicate hours. These fall right at the time
> change. How can I avoid this? (or remove the duplicates)?
If you want us to redefine Daylight Savings time, then you should specify in
great detail exactly how this should be done.
I don’t see any duplicates, anyway, since the DST zones are incuded:
> seq(as.POSIXct("2015-10-31 23:00"), as.POSIXct("2015-11-01 4:00"), by="1
> hour")
[1] "2015-10-31 23:00:00 PDT" "2015-11-01 00:00:00 PDT" "2015-11-01 01:00:00
PDT"
[4] "2015-11-01 01:00:00 PST" "2015-11-01 02:00:00 PST" "2015-11-01 03:00:00
PST"
[7] "2015-11-01 04:00:00 PST”
But if you use GMT you do get a sequence with no “duplicates:
> seq(as.POSIXct("2015-10-31 23:00", tz="GMT"), as.POSIXct("2015-11-01 4:00",
> tz="GMT"), by="1 hour")
[1] "2015-10-31 23:00:00 GMT" "2015-11-01 00:00:00 GMT" "2015-11-01 01:00:00
GMT"
[4] "2015-11-01 02:00:00 GMT" "2015-11-01 03:00:00 GMT" "2015-11-01 04:00:00
GMT"
>
> Thanks
> --
> Micha Silver
> Arava Drainage Authority
> +972-523-665918
>
> ______________________________________________
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David Winsemius
Alameda, CA, USA
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