[R] Converting "day of year" to "year", "month" and "day"

[Jim Lemon]

Hi Jibrin,
solar_wind_sps<-data.frame(sws=306,date="2021-016")
solar_wind_spd
solar_wind_spd$date<-as.Date(solar_wind_spd$date,"%Y-%j")
solar_wind_spd

This changes the "date" field to an actual date object. If you just
want to change a character string date to another format:

solar_wind_spd$date<-format(as.Date(solar_wind_spd$date,%Y-%j),"%Y-%m-%d")

Jim

On Sat, Jan 16, 2021 at 4:55 AM Jibrin Alhassan
<jibrin.alhassan using unn.edu.ng> wrote:
>
> Dear R users,
> I am very new to R software. I have solar wind speed data needed for my
> work. How do I convert day in the year to year, month, and day with R
> software? I have used this code
> as.Date(0, origin = "1998-01-01")
> but it can only convert one day of the year at a time. Meanwhile, I have up
> to the 1998-2002 data set. Attached is my data.
> Kindly help, please.
> Jibrin Alhassan
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