[R] Convert Long DOY time format to yyyymmdd hh format

[PIKAL Petr]

Hi

as.Date converts to dates (without hours), which is clearly stated in the
first line of documentation.

If you want include hour you should use ?strptime
Something like

> strptime("1963 335 1", format="%Y %j %H")
[1] "1963-12-01 01:00:00 CET"

You definitely does not need to do it one by one, but exact way depends on
how does the object look like in R.

Cheers
Petr

> -----Original Message-----
> From: R-help <r-help-bounces using r-project.org> On Behalf Of Ogbos Okike
> Sent: Thursday, January 23, 2020 10:24 AM
> To: r-help <r-help using r-project.org>
> Subject: [R] Convert Long DOY time format to yyyymmdd hh format
> 
> Dear Experts,
> I have a data spanning 56 years from 1963 to 2018.
> The datetime format is in DOY hour:
> 1963 335 0"
> 1963 335 1
> 1963 335 2
> 1963 335 3
> 1963 335 4
> 1963 335 5
> 1963 335 6
> 1963 335 7
> 1963 335 8
> 1963 335 9
> 1996 202 20
> 1996 202 21
> 1996 202 22
> 1996 202 23
> 1996 203 0
> 1996 203 1
> 1996 203 2
> 1996 203 3
> 2018 365 20
> 2018 365 21
> 2018 365 22
> 2018 365 23
> When I used:
> as.Date(335,origin="1963-01-01"), for the first row, I got:
> [1] "1963-12-02"
> This is the format I want, though it is not yet complete. Time is missing.
> 
> Again, I can't be doing this one after the other. I guess you have a
better way
> of handling this. I have spent some time trying to get it right but I am
really
> stuck. I would be most glad if you could spare your busy time to help me
> again.
> 
> Thank you very much for your usual kind assistance.
> 
> Best regards
> Ogbos
> 
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