[R] date conversion problem

[Jim Lemon]

Hi Abdoulaye,
It looks to me as though your offsets are in hours, not days. You can
get a rough date like this:

time<-c(1569072,1569096,1569120,1569144,
 1569168,1569192,1569216,1569240)
time_d<-as.Date("1800-01-01")+time/24
time_d
[1] "1979-01-01" "1979-01-02" "1979-01-03" "1979-01-04" "1979-01-05"
[6] "1979-01-06" "1979-01-07" "1979-01-08"

Jim

On Thu, Aug 13, 2020 at 6:10 PM Abdoulaye Sarr <abdoulayesar using gmail.com> wrote:
>
> I have dataset with time sine 1800-01-01 and extracted data from 1981 to
> 2019 and used these lines for the data conversion:
> > time_d <- as.Date(time, format="%j", origin=as.Date("1800-01-01"))
> > time_years <- format(time_d, "%Y")
> > time_months <- format(time_d, "%m")
> > time_year_months <- format(time_d, "%Y-%m")
> > head(time_d)
> [1] "6095-12-22" "6096-01-15" "6096-02-08" "6096-03-03" "6096-03-27"
> "6096-04-20"
>
> As you see these gregorian dates are unrealistic and wonder what I am doing
> wrong?
> The time from the raw file in Jd are like this:
>
> > time
>    [1] 1569072 1569096 1569120 1569144 1569168 1569192 1569216 1569240etc.
>
> Hope hint and/or suggestion to solve this.
>
> Best regards
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.